What is CVE-2022-40070?

CVE-2022-40070 is a high-severity vulnerability in Tenda Ac21, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2022-09-19.

How severe is CVE-2022-40070?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Tenda Ac21

CVE-2022-40070

Tenda AC21 V 16.03.08.15 is vulnerable to Buffer Overflow via bin/httpd, function: formSetFirewallCfg.

Vulnerability class: Buffer Overflow

Published 2022-09-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.010 · change: +0.001

Affected products

Tenda Ac21
Tenda Ac21 Firmware — versions 16.03.08.15

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/xxy1126/Vuln/tree/main/Tenda AC21/8 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-40070?: CVE-2022-40070 is a high-severity vulnerability in Tenda Ac21, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2022-09-19.
How severe is CVE-2022-40070?: High severity. CVSS v3 base score is 7.5 out of 10.