High 8.8Published Jan 29, 2026

CVE-2026-1637Tenda AC21 AdvSetMacMtuWan fromAdvSetMacMtuWan stack-based overflow

Updated under an hour ago (Oct 26, 2026, 1:50 PM ET)

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It affects Tenda AC21. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Tenda AC21

Exploited in the last 30 days

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 attack is possible. The exploit is publicly available and might be used.

CVSS: 8.8 HIGH (v3.1, CNA)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
Weakness (CWE): CWE-121, CWE-119
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Analyzed
Record last updated: Feb 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Tenda AC21 tenda:ac21_firmware	16.03.08.16	CNA record
tenda ac21_firmware tenda:ac21_firmware	16.03.08.16	NVD

References

References

https://vuldb.com/?id.343416	vdb-entry, technical-description, third-party-advisory
https://vuldb.com/?ctiid.343416	signature, permissions-required, vdb-entry
https://vuldb.com/?submit.740865	third-party-advisory, vdb-entry
https://github.com/LX-LX88/cve/issues/25	broken-link, exploit, issue-tracking
https://www.tenda.com.cn/	product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.