Is CVE-2021-31755 actively exploited?

CVE-2021-31755 has no public evidence of in-the-wild exploitation as of 2025-11-10.

What is the CVSS score for CVE-2021-31755?

CVE-2021-31755 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-31755?

Patch guidance is available from tenda security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-31755.

Which products are affected by CVE-2021-31755?

1 product: tenda ac11 firmware.

Fix CVE-2021-31755 - CRITICAL tenda ac11 firmware

Description

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

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-787 · Out-of-bounds Write CWE-787 · Out-of-bounds Write

Metadata

Primary Vendor: TENDA
Published: 5/7/2021
Last Modified: 11/10/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2021-31755

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary