Tenda AC21 up to 16.03.08.16 SetStaticRouteCfg sscanf list buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Tenda AC21 up to 16.03.08.16. Affected by this issue is the function sscanf of the file /goform/SetStaticRouteCfg. This manipulation of the argument list causes buffer overflow. This vulnerability appears as CVE-2025-11091. The attack may be initiated remotely. In addition, an exploit is available.

Detailsinfo

A vulnerability has been found in Tenda AC21 up to 16.03.08.16 and classified as critical. Affected by this vulnerability is the function sscanf of the file /goform/SetStaticRouteCfg. The manipulation of the argument list with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-11091. The exploitation appears to be easy. The attack can be launched remotely. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at CNNVD (CNNVD-202509-4313) and EUVD (EUVD-2025-31447). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.8
VulDB Temp Score: 8.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/27/2025 Advisory disclosed
09/27/2025 +0 days VulDB entry created
09/29/2025 +2 days VulDB entry last update

Sourcesinfo

Vendor: tenda.com.cn

Advisory: github.com
Status: Not defined

CVE: CVE-2025-11091 (🔒)
GCVE (CVE): GCVE-0-2025-11091
GCVE (VulDB): GCVE-100-326173
EUVD: 🔒
CNNVD: CNNVD-202509-4313 - Tenda AC21 安全漏洞

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/27/2025 07:31
Updated: 09/29/2025 17:54
Changes: 09/27/2025 07:31 (57), 09/28/2025 04:44 (31), 09/28/2025 05:16 (1), 09/29/2025 17:54 (6)
Complete: 🔍
Submitter: MaximDeVere
Cache ID: 216:9DB:103

Submitinfo

Accepted

  • Submit #661806: Shenzhen Tenda Technology Co.,Ltd. AC21 <= V16.03.08.16 Buffer Overflow (by MaximDeVere)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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