CVE-2021-31755

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 86.51%
EPSS Percentile: 99.74%
CISA KEV: YES — Known Exploited Vulnerability

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: cve@mitre.org
Published: 08-May-2021 06:15
Last Modified: 17-Jun-2026 10:52
EPSS Date: 2026-10-12
CWE: CWE-787

CVSS Vector


            CVSS:3.1                            AV:N /
                            AC:L /
                            PR:N /
                            UI:N /
                            S:U /
                            C:H /
                            I:H /
                            A:H

CISA KEV Details

Date Added: 2021-11-03
Remediation Due: 2021-11-17
Known Ransomware Campaign Use: Unknown
Required Action: Apply updates per vendor instructions.
Notes: https://nvd.nist.gov/vuln/detail/CVE-2021-31755

Affected Products / Versions

tenda / ac11_firmware
Version / affected range: * · through (inclusive) 02.03.01.104_cn
cpe:2.3:o:tenda:ac11_firmware:*:*:*:*:*:*:*:*

References

Last enrichment sync: 13-Oct-2026 05:00
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

CVE-2021-31755 Recorded Future Identifies 85 High-Impact Vulnerabilities in July, Many Actively Exploited

CVE (80)

Malware (4)

Threat Actors (8)

Vendors (25)

Products (70)

Tools (1)

Countries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.