CVE-2026-1637

Name: CVE-2026-1637
Creator: NVD / NIST
Published: 2026-01-29T23:16:11.473+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 0.65%

Last modified Jun 17, 2026

CVE-2026-1637 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function fromAdvSetMacMtuWan of the file /goform/AdvSetMacMtuWan. EPSS estimates a 0.65% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

7.4/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.65%

46.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Tenda	Ac21 Firmware	16.03.08.16

References

https://github.com/LX-LX88/cve/issues/25Broken Link
https://vuldb.com/?ctiid.343416Permissions Required, VDB Entry
https://vuldb.com/?id.343416Third Party Advisory, VDB Entry
https://vuldb.com/?submit.740865Third Party Advisory, VDB Entry
https://www.tenda.com.cn/Product
https://github.com/LX-LX88/cve/issues/25Broken Link

Timeline

Published: Jan 29, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-1637?

How severe is CVE-2026-1637?

CVE-2026-1637 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.65% probability of exploitation in the next 30 days.

How do I fix CVE-2026-1637?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-1637?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST