What is CVE-2021-46263?

CVE-2021-46263 is a critical-severity vulnerability in Tenda Ac11, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-02-15.

How severe is CVE-2021-46263?

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

Is CVE-2021-46263 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Tenda Ac11

CVE-2021-46263

Tenda AC Series Router AC11_V02.03.01.104_CN was discovered to contain a stack buffer overflow in the wifiTime module. This vulnerability allows attackers to cause a Denial of Service (DoS) via crafted overflow data.

Vulnerability class: Buffer Overflow

Published 2022-02-15 · 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: 0.017 (76.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Tenda Ac11
Tenda Ac11 Firmware — versions 02.03.01.104_cn

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

github.com/Ainevsia/CVE-Request/tree/main/Tenda/11 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-46263?: CVE-2021-46263 is a critical-severity vulnerability in Tenda Ac11, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2022-02-15.
How severe is CVE-2021-46263?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-46263 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.