CVE-2026-9431: Stack-based Buffer Overflow in Tenda F1202
CVE-2026-9431 is a high-severity stack-based buffer overflow vulnerability in the Tenda F1202 router firmware version 1.2.0.20(408). The flaw exists in the fromPptpUserAdd function, specifically in the handling of the opttype argument in the /goform/PptpUserAdd endpoint. This vulnerability can be exploited remotely without user interaction or privileges. Although an exploit is publicly available, there are no confirmed reports of exploitation in the wild. No official patch or remediation guidance has been provided by the vendor as of the publication date.
AI Analysis
Technical Summary
The vulnerability CVE-2026-9431 affects Tenda F1202 firmware version 1.2.0.20(408). It is a stack-based buffer overflow triggered by improper handling of the opttype parameter in the fromPptpUserAdd function, accessible via the /goform/PptpUserAdd endpoint. The vulnerability allows remote attackers to cause memory corruption, potentially leading to arbitrary code execution or denial of service. The CVSS 4.0 base score is 8.7, reflecting high impact and ease of exploitation with no required privileges or user interaction. No official patch or vendor advisory is currently available.
Potential Impact
Successful exploitation of this vulnerability can lead to remote code execution or denial of service on affected Tenda F1202 devices. The vulnerability is remotely exploitable without authentication or user interaction, increasing the risk to exposed devices. The availability of a public exploit increases the likelihood of attempted attacks, although no active exploitation has been confirmed.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, affected users should consider disabling the vulnerable service or restricting access to the /goform/PptpUserAdd endpoint via network controls to trusted sources only. Monitor vendor channels for updates and apply patches promptly once available.
CVE-2026-9431: Stack-based Buffer Overflow in Tenda F1202
Description
CVE-2026-9431 is a high-severity stack-based buffer overflow vulnerability in the Tenda F1202 router firmware version 1.2.0.20(408). The flaw exists in the fromPptpUserAdd function, specifically in the handling of the opttype argument in the /goform/PptpUserAdd endpoint. This vulnerability can be exploited remotely without user interaction or privileges. Although an exploit is publicly available, there are no confirmed reports of exploitation in the wild. No official patch or remediation guidance has been provided by the vendor as of the publication date.
CVSS v4.0
Score 8.7high
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-9431 affects Tenda F1202 firmware version 1.2.0.20(408). It is a stack-based buffer overflow triggered by improper handling of the opttype parameter in the fromPptpUserAdd function, accessible via the /goform/PptpUserAdd endpoint. The vulnerability allows remote attackers to cause memory corruption, potentially leading to arbitrary code execution or denial of service. The CVSS 4.0 base score is 8.7, reflecting high impact and ease of exploitation with no required privileges or user interaction. No official patch or vendor advisory is currently available.
Potential Impact
Successful exploitation of this vulnerability can lead to remote code execution or denial of service on affected Tenda F1202 devices. The vulnerability is remotely exploitable without authentication or user interaction, increasing the risk to exposed devices. The availability of a public exploit increases the likelihood of attempted attacks, although no active exploitation has been confirmed.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, affected users should consider disabling the vulnerable service or restricting access to the /goform/PptpUserAdd endpoint via network controls to trusted sources only. Monitor vendor channels for updates and apply patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-05-24T07:03:29.836Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a13eec0a5ae1af1aa6777c9
Added to database: 05/25/2026, 06:40:00 UTC
Last enriched: 06/01/2026, 21:00:35 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 105
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