What is CVE-2022-40868?

CVE-2022-40868 is a critical-severity vulnerability in Tenda W20e, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-09-23.

How severe is CVE-2022-40868?

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

Buffer overflow in Tenda W20e

CVE-2022-40868

Tenda W20E router V15.11.0.6 (US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC) contains a stack overflow vulnerability in the function formDelDhcpRule with the request /goform/delDhcpRules/

Vulnerability class: Buffer Overflow

Published 2022-09-23 · 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: 0.012 (67.3th percentile), scored 2026-10-25.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.012 · change: +0.000

Affected products

Tenda W20e
Tenda W20e Firmware — versions 15.11.0.6

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/CPSeek/Router-vuls/blob/main/Tenda/W20E/formDelDhcpRule.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-40868?: CVE-2022-40868 is a critical-severity vulnerability in Tenda W20e, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-09-23.
How severe is CVE-2022-40868?: Critical severity. CVSS v3 base score is 9.8 out of 10.