What is CVE-2022-40876?

CVE-2022-40876 is a critical-severity vulnerability in Tenda Ax1803, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-10-27.

How severe is CVE-2022-40876?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Tenda Ax1803

CVE-2022-40876

In Tenda ax1803 v1.0.0.1, the http requests handled by the fromAdvSetMacMtuWan functions, wanSpeed, cloneType, mac, can cause a stack overflow and enable remote code execution (RCE).

Vulnerability class: Buffer Overflow

Published 2022-10-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.5th percentile), scored 2026-10-04.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.020 · change: +0.001

Affected products

Tenda Ax1803
Tenda Ax1803 Firmware — versions 1.0.0.1

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.cnblogs.com/L0g4n-blog/p/16695155.html (Exploit, Third Party Advisory)
www.cnblogs.com/L0g4n-blog/p/16704071.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-40876?: CVE-2022-40876 is a critical-severity vulnerability in Tenda Ax1803, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-10-27.
How severe is CVE-2022-40876?: Critical severity. CVSS v3 base score is 9.8 out of 10.