Buffer overflow in Tenda Ac21
CVE-2026-1637
A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. The manipulation leads to stack-based buffer overflow. Remote exploitation of the attac…
Vulnerability class: Buffer Overflow
EPSS: 0.000 (13.8th 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 16.03.08.16
Weakness classification (CWE)
References
- VDB-343416 | Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow (vdb-entry, technical-description)
- VDB-343416 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
- Submit #740865 | Tenda AC21 V16.03.08.16 Buffer Overflow (third-party-advisory)
- github.com/LX-LX88/cve/issues/25 (broken-link, exploit, issue-tracking)
- www.tenda.com.cn/ (product)
Frequently asked questions
- What is CVE-2026-1637?
- CVE-2026-1637 is a high-severity vulnerability in Tenda Ac21, classified under Stack-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-01-29.
- How severe is CVE-2026-1637?
- High severity. CVSS v3 base score is 8.8 out of 10.