What is CVE-2021-45391?

CVE-2021-45391 is a high-severity vulnerability in Tenda Ax12, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2022-02-16.

How severe is CVE-2021-45391?

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

Buffer overflow in Tenda Ax12

CVE-2021-45391

A Buffer Overflow vulnerability exists in Tenda Router AX12 V22.03.01.21_CN in the sub_422CE4 function in the goform/setIPv6Status binary file /usr/sbin/httpd via the conType parameter, which causes a Denial of Service.

Vulnerability class: Buffer Overflow

Published 2022-02-16 · 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: 0.018 (78.1th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Tenda Ax12
Tenda Ax12 Firmware — versions 22.03.01.21_cn

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

www.tenda.com.cn/ (Vendor Advisory)
tendawifi.com/index.html (Broken Link)
www.tenda.com.cn/product/AX12.html (Product, Vendor Advisory)
github.com/sec-bin/IoT-CVE/tree/main/Tenda/AX12/1 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-45391?: CVE-2021-45391 is a high-severity vulnerability in Tenda Ax12, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2022-02-16.
How severe is CVE-2021-45391?: High severity. CVSS v3 base score is 7.5 out of 10.