CVE-2021-35395
Detail
Description
Realtek Jungle SDK version v2.x up to v3.4.14B provides an HTTP web server exposing a management interface that can be used to configure the access point. Two versions of this management interface exists: one based on Go-Ahead named webs and another based on Boa named boa. Both of them are affected by these vulnerabilities. Specifically, these binaries are vulnerable to the following issues: - stack buffer overflow in formRebootCheck due to unsafe copy of submit-url parameter - stack buffer overflow in formWsc due to unsafe copy of submit-url parameter - stack buffer overflow in formWlanMultipleAP due to unsafe copy of submit-url parameter - stack buffer overflow in formWlSiteSurvey due to unsafe copy of ifname parameter - stack buffer overflow in formStaticDHCP due to unsafe copy of hostname parameter - stack buffer overflow in formWsc due to unsafe copy of 'peerPin' parameter - arbitrary command execution in formSysCmd via the sysCmd parameter - arbitrary command injection in formWsc via the 'peerPin' parameter Exploitability of identified issues will differ based on what the end vendor/manufacturer did with the Realtek SDK webserver. Some vendors use it as-is, others add their own authentication implementation, some kept all the features from the server, some remove some of them, some inserted their own set of features. However, given that Realtek SDK implementation is full of insecure calls and that developers tends to re-use those examples in their custom code, any binary based on Realtek SDK webserver will probably contains its own set of issues on top of the Realtek ones (if kept). Successful exploitation of these issues allows remote attackers to gain arbitrary code execution on the device.
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.
CVSS 3.x Severity and Vector Strings:
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 Severity and Vector Strings:
Vector:
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
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This CVE is in CISA's Known Exploited Vulnerabilities Catalog
Reference
CISA's BOD 22-01 and Known
Exploited Vulnerabilities Catalog for further guidance and requirements.
| Vulnerability Name |
Date Added |
Due Date |
Required Action |
| Realtek AP-Router SDK Buffer Overflow Vulnerability |
11/03/2021 |
11/17/2021 |
Apply updates per vendor instructions. |
Change History
13 change records found show changes
CVE Modified by CISA-ADP
6/16/2026 11:57:29 PM
| Action |
Type |
Old Value |
New Value |
| Added |
SSVC |
{"timestamp":"2025-02-04T19:38:55.973826Z","id":"CVE-2021-35395","options":[{"exploitation":"active"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}
|
CVE Modified by MITRE
6/16/2026 11:57:29 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Affected |
[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]
|
Modified Analysis by NIST
11/07/2025 2:00:50 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference Type |
CISA-ADP: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35395 Types: US Government Resource
|
CVE Modified by CISA-ADP
10/21/2025 8:17:38 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35395
|
CVE Modified by CISA-ADP
10/21/2025 4:18:39 PM
| Action |
Type |
Old Value |
New Value |
| Removed |
Reference |
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35395
|
CVE Modified by CISA-ADP
10/21/2025 3:19:10 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35395
|
Reanalysis by NIST
8/13/2025 11:22:20 AM
| Action |
Type |
Old Value |
New Value |
| Changed |
CPE Configuration |
OR
*cpe:2.3:a:realtek:realtek_jungle_sdk:*:*:*:*:*:*:*:* versions from (including) 2.0 up to (including) 3.4.14b
|
OR
*cpe:2.3:a:realtek:rtl819x_jungle_software_development_kit:*:*:*:*:*:*:*:* versions from (including) 2.0 up to (including) 3.4.14b
|
| Changed |
Reference Type |
CVE: https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Types: Exploit, Third Party Advisory
|
CVE: https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Types: Broken Link, Exploit, Third Party Advisory
|
| Changed |
Reference Type |
CVE: https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Types: Patch, Vendor Advisory
|
CVE: https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Types: Broken Link, Patch, Vendor Advisory
|
| Changed |
Reference Type |
MITRE: https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Types: Exploit, Third Party Advisory
|
MITRE: https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Types: Broken Link, Exploit, Third Party Advisory
|
| Changed |
Reference Type |
MITRE: https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Types: Patch, Vendor Advisory
|
MITRE: https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Types: Broken Link, Patch, Vendor Advisory
|
Modified Analysis by NIST
4/03/2025 3:15:22 PM
| Action |
Type |
Old Value |
New Value |
CVE Modified by CISA-ADP
2/04/2025 3:15:43 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CVSS V3.1 |
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
|
CVE Modified by CVE
11/21/2024 1:12:17 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain
|
| Added |
Reference |
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en
|
| Added |
Reference |
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf
|
CVE Modified by MITRE
5/14/2024 5:17:28 AM
| Action |
Type |
Old Value |
New Value |
CWE Remap by NIST
8/08/2023 10:21:49 AM
| Action |
Type |
Old Value |
New Value |
| Changed |
CWE |
CWE-77
CWE-787
|
NVD-CWE-Other
|
Initial Analysis by NIST
8/26/2021 10:27:39 AM
| Action |
Type |
Old Value |
New Value |
| Added |
CVSS V3.1 |
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
|
| Added |
CVSS V2 |
NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C)
|
| Added |
CWE |
NIST CWE-77
|
| Added |
CWE |
NIST CWE-787
|
| Added |
CPE Configuration |
OR
*cpe:2.3:a:realtek:realtek_jungle_sdk:*:*:*:*:*:*:*:* versions from (including) 2.0 up to (including) 3.4.14b
|
| Changed |
Reference Type |
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain No Types Assigned
|
https://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain Exploit, Third Party Advisory
|
| Changed |
Reference Type |
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en No Types Assigned
|
https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en Patch, Vendor Advisory
|
| Changed |
Reference Type |
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf No Types Assigned
|
https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf Patch
|
Quick Info
CVE Dictionary Entry: CVE-2021-35395 NVD
Published Date: 08/16/2021 NVD
Last Modified: 06/16/2026
Source: MITRE
|
