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CVE-2025-11091— Tenda AC21 SetStaticRouteCfg sscanf buffer overflow

Quick assessment

Affected
Tenda AC21
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tenda AC21是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC21 16.03.08.16及之前版本存在安全漏洞，该漏洞源于对文件/goform/SetStaticRouteCfg中参数list的错误操作，可能导致缓冲区溢出。

CVSS 8.8 · High EPSS 0.74% · P53

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-11091

Vulnerability Information
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Vulnerability Title
Tenda AC21 SetStaticRouteCfg sscanf buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in Tenda AC21 up to 16.03.08.16. Affected by this vulnerability is the function sscanf of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remotely. The exploit has been released to the public and may be exploited.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda AC21 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda AC21是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC21 16.03.08.16及之前版本存在安全漏洞，该漏洞源于对文件/goform/SetStaticRouteCfg中参数list的错误操作，可能导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Tenda AC21 16.03.08.0 -

II. Public POCs for CVE-2025-11091

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 4762 chars
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2025-11091

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Same Patch Batch · Tenda · 2025-09-28 · 6 CVEs total

CVE-2025-11123 8.8 HIGH Tenda AC18 saveAutoQos stack-based overflow
CVE-2025-11122 8.8 HIGH Tenda AC18 WizardHandle stack-based overflow
CVE-2025-11120 8.8 HIGH Tenda AC8 SetServerConfig formSetServerConfig buffer overflow
CVE-2025-11117 8.8 HIGH Tenda CH22 GstDhcpSetSer formWrlExtraGet buffer overflow
CVE-2025-11121 6.3 MEDIUM Tenda AC18 AdvSetLanip command injection

IV. Related Vulnerabilities

Same product: AC21
Same vendor: Tenda
Same weakness: CWE-120

V. Comments for CVE-2025-11091

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