VOOZH about

URL: https://nvd.nist.gov/vuln/detail/CVE-2024-3661

⇱ NVD - CVE-2024-3661

  1. Vulnerabilities

CVE-2024-3661 Detail

Description

DHCP can add routes to a client’s routing table via the classless static route option (121). VPN-based security solutions that rely on routes to redirect traffic can be forced to leak traffic over the physical interface. An attacker on the same local network can read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/ CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Exploit  Press/Media Coverage 
https://bst.cisco.com/quickview/bug/CSCwk05814 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Third Party Advisory  Vendor Advisory 
https://datatracker.ietf.org/doc/html/rfc2131#section-7 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Related 
https://datatracker.ietf.org/doc/html/rfc3442#section-7 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Related 
https://fortiguard.fortinet.com/psirt/FG-IR-24-170 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Vendor Advisory 
https://issuetracker.google.com/issues/263721377 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Issue Tracking 
https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/ CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Exploit  Press/Media Coverage 
https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Issue Tracking 
https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Third Party Advisory 
https://my.f5.com/manage/s/article/K000139553 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Vendor Advisory 
https://news.ycombinator.com/item?id=40279632 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Issue Tracking 
https://news.ycombinator.com/item?id=40284111 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Issue Tracking 
https://security.paloaltonetworks.com/CVE-2024-3661 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Vendor Advisory 
https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Vendor Advisory 
https://tunnelvisionbug.com/ CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Exploit  Third Party Advisory 
https://www.agwa.name/blog/post/hardening_openvpn_for_def_con CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Related 
https://www.leviathansecurity.com/research/tunnelvision CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Third Party Advisory 
https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/ CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Exploit  Press/Media Coverage 
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009 CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Mitigation  Third Party Advisory  Vendor Advisory 
https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability CVE, Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government Exploit  Third Party Advisory  Vendor Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-306 Missing Authentication for Critical Function 👁 cwe source acceptance level
NIST   Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government  
CWE-501 Trust Boundary Violation Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government  

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

13 change records found show changes

CVE Modified by CISA-ADP 6/17/2026 3:44:45 AM

Action Type Old Value New Value
Added SSVC 
{"timestamp":"2024-05-08T04:00:07.962328Z","id":"CVE-2024-3661","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 6/17/2026 3:44:45 AM

Action Type Old Value New Value
Added Affected 
[{"vendor":"IETF","product":"DHCP","defaultStatus":"affected","versions":[{"version":"0","status":"affected"}]}]

Initial Analysis by NIST 1/15/2025 11:50:28 AM

Action Type Old Value New Value
Added CVSS V3.1 
NIST AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Added CWE 
NIST CWE-306
Added CPE Configuration 
AND
 OR
 *cpe:2.3:a:citrix:secure_access_client:*:*:*:*:*:*:*:* versions up to (excluding) 24.06.1
 OR
 cpe:2.3:o:apple:iphone_os:-:*:*:*:*:*:*:*
 cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*
Added CPE Configuration 
AND
 OR
 *cpe:2.3:a:citrix:secure_access_client:*:*:*:*:*:*:*:* versions up to (excluding) 24.8.5
 OR
 cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Added CPE Configuration 
OR
 *cpe:2.3:a:cisco:anyconnect_vpn_client:-:*:*:*:*:*:*:*
 *cpe:2.3:a:cisco:secure_client:-:*:*:*:*:*:*:*
Added CPE Configuration 
OR
 *cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* versions from (including) 7.2.3 up to (including) 7.2.5
 *cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* versions from (including) 15.1.0 up to (including) 15.1.10
 *cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* versions from (including) 16.1.0 up to (including) 16.1.5
 *cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:* versions from (including) 17.1.0 up to (including) 17.1.2
Added CPE Configuration 
OR
 *cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:linux:*:* versions from (including) 6.4.0 up to (excluding) 7.2.5
 *cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:* versions from (including) 6.4.0 up to (excluding) 7.2.5
 *cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:* versions from (including) 6.4.0 up to (excluding) 7.2.5
 *cpe:2.3:a:fortinet:forticlient:7.4.0:*:*:*:*:linux:*:*
 *cpe:2.3:a:fortinet:forticlient:7.4.0:*:*:*:*:macos:*:*
 *cpe:2.3:a:fortinet:forticlient:7.4.0:*:*:*:*:windows:*:*
Added CPE Configuration 
OR
 *cpe:2.3:a:paloaltonetworks:globalprotect:*:*:*:*:*:iphone_os:*:*
 *cpe:2.3:a:paloaltonetworks:globalprotect:*:*:*:*:*:linux:*:*
 *cpe:2.3:a:paloaltonetworks:globalprotect:*:*:*:*:*:macos:*:*
 *cpe:2.3:a:paloaltonetworks:globalprotect:*:*:*:*:*:windows:*:*
Added CPE Configuration 
OR
 *cpe:2.3:a:watchguard:ipsec_mobile_vpn_client:*:*:*:*:*:macos:*:*
 *cpe:2.3:a:watchguard:ipsec_mobile_vpn_client:*:*:*:*:*:windows:*:*
 *cpe:2.3:a:watchguard:mobile_vpn_with_ssl:*:*:*:*:*:macos:*:*
 *cpe:2.3:a:watchguard:mobile_vpn_with_ssl:*:*:*:*:*:windows:*:*
Added CPE Configuration 
OR
 *cpe:2.3:a:zscaler:client_connector:-:*:*:*:*:windows:*:*
 *cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:linux:*:* versions up to (excluding) 1.5.1.25
 *cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:linux:*:* versions from (including) 3.7 up to (excluding) 3.7.0.134
 *cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:macos:*:* versions up to (excluding) 4.2.0.282
Changed Reference Type 
https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/ No Types Assigned


 
https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/ Exploit, Press/Media Coverage
Changed Reference Type 
https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/ No Types Assigned


 
https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/ Exploit, Press/Media Coverage
Changed Reference Type 
https://bst.cisco.com/quickview/bug/CSCwk05814 No Types Assigned


 
https://bst.cisco.com/quickview/bug/CSCwk05814 Third Party Advisory
Changed Reference Type 
https://bst.cisco.com/quickview/bug/CSCwk05814 No Types Assigned


 
https://bst.cisco.com/quickview/bug/CSCwk05814 Third Party Advisory
Changed Reference Type 
https://datatracker.ietf.org/doc/html/rfc2131#section-7 No Types Assigned


 
https://datatracker.ietf.org/doc/html/rfc2131#section-7 Related
Changed Reference Type 
https://datatracker.ietf.org/doc/html/rfc2131#section-7 No Types Assigned


 
https://datatracker.ietf.org/doc/html/rfc2131#section-7 Related
Changed Reference Type 
https://datatracker.ietf.org/doc/html/rfc3442#section-7 No Types Assigned


 
https://datatracker.ietf.org/doc/html/rfc3442#section-7 Related
Changed Reference Type 
https://datatracker.ietf.org/doc/html/rfc3442#section-7 No Types Assigned


 
https://datatracker.ietf.org/doc/html/rfc3442#section-7 Related
Changed Reference Type 
https://fortiguard.fortinet.com/psirt/FG-IR-24-170 No Types Assigned


 
https://fortiguard.fortinet.com/psirt/FG-IR-24-170 Vendor Advisory
Changed Reference Type 
https://fortiguard.fortinet.com/psirt/FG-IR-24-170 No Types Assigned


 
https://fortiguard.fortinet.com/psirt/FG-IR-24-170 Vendor Advisory
Changed Reference Type 
https://issuetracker.google.com/issues/263721377 No Types Assigned


 
https://issuetracker.google.com/issues/263721377 Issue Tracking
Changed Reference Type 
https://issuetracker.google.com/issues/263721377 No Types Assigned


 
https://issuetracker.google.com/issues/263721377 Issue Tracking
Changed Reference Type 
https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/ No Types Assigned


 
https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/ Exploit, Press/Media Coverage
Changed Reference Type 
https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/ No Types Assigned


 
https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/ Exploit, Press/Media Coverage
Changed Reference Type 
https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic No Types Assigned


 
https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic Issue Tracking
Changed Reference Type 
https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic No Types Assigned


 
https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic Issue Tracking
Changed Reference Type 
https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision No Types Assigned


 
https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision Third Party Advisory
Changed Reference Type 
https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision No Types Assigned


 
https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision Third Party Advisory
Changed Reference Type 
https://my.f5.com/manage/s/article/K000139553 No Types Assigned


 
https://my.f5.com/manage/s/article/K000139553 Vendor Advisory
Changed Reference Type 
https://my.f5.com/manage/s/article/K000139553 No Types Assigned


 
https://my.f5.com/manage/s/article/K000139553 Vendor Advisory
Changed Reference Type 
https://news.ycombinator.com/item?id=40279632 No Types Assigned


 
https://news.ycombinator.com/item?id=40279632 Issue Tracking
Changed Reference Type 
https://news.ycombinator.com/item?id=40279632 No Types Assigned


 
https://news.ycombinator.com/item?id=40279632 Issue Tracking
Changed Reference Type 
https://news.ycombinator.com/item?id=40284111 No Types Assigned


 
https://news.ycombinator.com/item?id=40284111 Issue Tracking
Changed Reference Type 
https://news.ycombinator.com/item?id=40284111 No Types Assigned


 
https://news.ycombinator.com/item?id=40284111 Issue Tracking
Changed Reference Type 
https://security.paloaltonetworks.com/CVE-2024-3661 No Types Assigned


 
https://security.paloaltonetworks.com/CVE-2024-3661 Vendor Advisory
Changed Reference Type 
https://security.paloaltonetworks.com/CVE-2024-3661 No Types Assigned


 
https://security.paloaltonetworks.com/CVE-2024-3661 Vendor Advisory
Changed Reference Type 
https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661 No Types Assigned


 
https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661 Vendor Advisory
Changed Reference Type 
https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661 No Types Assigned


 
https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661 Vendor Advisory
Changed Reference Type 
https://tunnelvisionbug.com/ No Types Assigned


 
https://tunnelvisionbug.com/ Exploit, Third Party Advisory
Changed Reference Type 
https://tunnelvisionbug.com/ No Types Assigned


 
https://tunnelvisionbug.com/ Exploit, Third Party Advisory
Changed Reference Type 
https://www.agwa.name/blog/post/hardening_openvpn_for_def_con No Types Assigned


 
https://www.agwa.name/blog/post/hardening_openvpn_for_def_con Related
Changed Reference Type 
https://www.agwa.name/blog/post/hardening_openvpn_for_def_con No Types Assigned


 
https://www.agwa.name/blog/post/hardening_openvpn_for_def_con Related
Changed Reference Type 
https://www.leviathansecurity.com/research/tunnelvision No Types Assigned


 
https://www.leviathansecurity.com/research/tunnelvision Third Party Advisory
Changed Reference Type 
https://www.leviathansecurity.com/research/tunnelvision No Types Assigned


 
https://www.leviathansecurity.com/research/tunnelvision Third Party Advisory
Changed Reference Type 
https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/ No Types Assigned


 
https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/ Exploit, Press/Media Coverage
Changed Reference Type 
https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/ No Types Assigned


 
https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/ Exploit, Press/Media Coverage
Changed Reference Type 
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009 No Types Assigned


 
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009 Mitigation, Vendor Advisory
Changed Reference Type 
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009 No Types Assigned


 
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009 Mitigation, Vendor Advisory
Changed Reference Type 
https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability No Types Assigned


 
https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability Exploit, Vendor Advisory
Changed Reference Type 
https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability No Types Assigned


 
https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability Exploit, Vendor Advisory

CVE Modified by CVE 11/21/2024 4:30:07 AM

Action Type Old Value New Value
Added Reference 
https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/
Added Reference 
https://bst.cisco.com/quickview/bug/CSCwk05814
Added Reference 
https://datatracker.ietf.org/doc/html/rfc2131#section-7
Added Reference 
https://datatracker.ietf.org/doc/html/rfc3442#section-7
Added Reference 
https://fortiguard.fortinet.com/psirt/FG-IR-24-170
Added Reference 
https://issuetracker.google.com/issues/263721377
Added Reference 
https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/
Added Reference 
https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic
Added Reference 
https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision
Added Reference 
https://my.f5.com/manage/s/article/K000139553
Added Reference 
https://news.ycombinator.com/item?id=40279632
Added Reference 
https://news.ycombinator.com/item?id=40284111
Added Reference 
https://security.paloaltonetworks.com/CVE-2024-3661
Added Reference 
https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661
Added Reference 
https://tunnelvisionbug.com/
Added Reference 
https://www.agwa.name/blog/post/hardening_openvpn_for_def_con
Added Reference 
https://www.leviathansecurity.com/research/tunnelvision
Added Reference 
https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/
Added Reference 
https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009
Added Reference 
https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 7/01/2024 11:15:17 AM

Action Type Old Value New Value
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://bst.cisco.com/quickview/bug/CSCwk05814 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://fortiguard.fortinet.com/psirt/FG-IR-24-170 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://my.f5.com/manage/s/article/K000139553 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://security.paloaltonetworks.com/CVE-2024-3661 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009 [No types assigned]

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 5/14/2024 11:42:00 AM

Action Type Old Value New Value

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 5/08/2024 6:15:49 PM

Action Type Old Value New Value
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/ [No types assigned]

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 5/08/2024 1:15:07 PM

Action Type Old Value New Value
Changed Description 
By design, the DHCP protocol does not authenticate messages, including for example the classless static route option (121). An attacker with the ability to send DHCP messages can manipulate routes to redirect VPN traffic, allowing the attacker to read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN. Many, if not most VPN systems based on IP routing are susceptible to such attacks.



DHCP can add routes to a client’s routing table via the classless static route option (121). VPN-based security solutions that rely on routes to redirect traffic can be forced to leak traffic over the physical interface. An attacker on the same local network can read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN.

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 5/07/2024 3:15:08 PM

Action Type Old Value New Value
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://news.ycombinator.com/item?id=40284111 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.agwa.name/blog/post/hardening_openvpn_for_def_con [No types assigned]

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 5/07/2024 2:15:08 PM

Action Type Old Value New Value
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/ [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://issuetracker.google.com/issues/263721377 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/ [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability [No types assigned]

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 5/07/2024 2:15:09 AM

Action Type Old Value New Value
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://news.ycombinator.com/item?id=40279632 [No types assigned]

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 5/06/2024 9:15:06 PM

Action Type Old Value New Value
Added CVSS V3.1 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Removed CVSS V3.1 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://tunnelvisionbug.com/ [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.leviathansecurity.com/research/tunnelvision [No types assigned]
Removed Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.leviathansecurity.com/blog/tunnelvision

New CVE Received from Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 5/06/2024 3:15:11 PM

Action Type Old Value New Value
Added Description 
By design, the DHCP protocol does not authenticate messages, including for example the classless static route option (121). An attacker with the ability to send DHCP messages can manipulate routes to redirect VPN traffic, allowing the attacker to read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN. Many, if not most VPN systems based on IP routing are susceptible to such attacks.


Added CVSS V3.1 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L
Added CWE 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government CWE-306
Added CWE 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government CWE-501
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://datatracker.ietf.org/doc/html/rfc2131#section-7 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://datatracker.ietf.org/doc/html/rfc3442#section-7 [No types assigned]
Added Reference 
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.leviathansecurity.com/blog/tunnelvision [No types assigned]

Quick Info

CVE Dictionary Entry:
CVE-2024-3661
NVD Published Date:
05/06/2024
NVD Last Modified:
06/17/2026
Source:
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government