What is CVE-2021-31757?

CVE-2021-31757 is a critical-severity vulnerability in Tenda Ac11, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-05-07.

How severe is CVE-2021-31757?

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

Is CVE-2021-31757 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-2021-31757

An issue was discovered on Tenda AC11 devices with firmware through 02.03.01.104_CN. A stack buffer overflow vulnerability in /goform/setVLAN allows attackers to execute arbitrary code on the system via a crafted post request.

Vulnerability class: Buffer Overflow

EPSS: 0.033 (87.1th percentile) — read the EPSS interpretation.

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.

Affected products

Tenda Ac11
Tenda Ac11_firmware
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-31757?: CVE-2021-31757 is a critical-severity vulnerability in Tenda Ac11, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-05-07.
How severe is CVE-2021-31757?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-31757 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.