Buffer overflow in Tenda Ac21
CVE-2025-11091
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…
Vulnerability class: Buffer Overflow
EPSS: 0.003 (49.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.
Affected products
- Tenda Ac21 — versions 16.03.08.0, 16.03.08.1, 16.03.08.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- VDB-326173 | Tenda AC21 SetStaticRouteCfg sscanf buffer overflow (vdb-entry, technical-description)
- VDB-326173 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #661806 | Shenzhen Tenda Technology Co.,Ltd. AC21 <= V16.03.08.16 Buffer Overflow (third-party-advisory)
- github.com/maximdevere/CVE2/issues/2 (exploit, issue-tracking)
- www.tenda.com.cn/ (product)
Frequently asked questions
- What is CVE-2025-11091?
- CVE-2025-11091 is a high-severity vulnerability in Tenda Ac21, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 8.8/10. Published 2025-09-28.
- How severe is CVE-2025-11091?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2025-11091 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.