CVE-2021-35395

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Summary

CVECVE-2021-35395
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-08-16 12:15:00 UTC
Updated2023-08-08 14:21:00 UTC
DescriptionRealtek 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.

Risk And Classification

EPSS: 0.936630000 probability, percentile 0.998420000 (date 2026-04-02)

CISA KEV: Listed on 2021-11-03; due 2021-11-17; ransomware use Unknown

Problem Types: NVD-CWE-Other

CISA Known Exploited Vulnerability

VendorRealtek
ProductAP-Router SDK
NameRealtek AP-Router SDK Buffer Overflow Vulnerability
Required ActionApply updates per vendor instructions.
Noteshttps://nvd.nist.gov/vuln/detail/CVE-2021-35395

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Realtek Realtek Jungle Sdk All All All All

References

ReferenceSourceLinkTags
Taiwan Headquarters - REALTEK MISC www.realtek.com
www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-353... MISC www.realtek.com
Advisory: Multiple Issues in Realtek SDK Affects Hundreds of Thousands of Devices Down the Supply Chain - IoT Inspector MISC www.iot-inspector.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Legacy QID Mappings

  • 731298 Realtek Jungle Software Development Kit (SDK) Command Injection Vulnerability
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