CVE-2021-27691

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 25.18%
EPSS Percentile: 97.90%
CISA KEV: Not listed

Description

Command Injection in Tenda G0 routers with firmware versions v15.11.0.6(9039)_CN and v15.11.0.5(5876)_CN , and Tenda G1 and G3 routers with firmware versions v15.11.0.17(9502)_CN or v15.11.0.16(9024)_CN allows remote attackers to execute arbitrary OS commands via a crafted action/setDebugCfg request. This occurs because the "formSetDebugCfg" function executes glibc's system function with untrusted input.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: cve@mitre.org
Published: 16-Apr-2021 07:15
Last Modified: 17-Jun-2026 10:45
EPSS Date: 2026-10-13
CWE: CWE-78, CWE-119

CVSS Vector


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

Affected Products / Versions

tendacn / g0_firmware
Version / affected range: 15.11.0.5\(5876\)_cn
cpe:2.3:o:tendacn:g0_firmware:15.11.0.5\(5876\)_cn:*:*:*:*:*:*:*
tendacn / g0_firmware
Version / affected range: 15.11.0.6\(9039\)_cn
cpe:2.3:o:tendacn:g0_firmware:15.11.0.6\(9039\)_cn:*:*:*:*:*:*:*
tendacn / g1_firmware
Version / affected range: 15.11.0.16\(9024\)_cn
cpe:2.3:o:tendacn:g1_firmware:15.11.0.16\(9024\)_cn:*:*:*:*:*:*:*
tendacn / g1_firmware
Version / affected range: 15.11.0.17\(9502\)_cn
cpe:2.3:o:tendacn:g1_firmware:15.11.0.17\(9502\)_cn:*:*:*:*:*:*:*
tendacn / g3_firmware
Version / affected range: 15.11.0.16\(9024\)_cn
cpe:2.3:o:tendacn:g3_firmware:15.11.0.16\(9024\)_cn:*:*:*:*:*:*:*
tendacn / g3_firmware
Version / affected range: 15.11.0.17\(9502\)_cn
cpe:2.3:o:tendacn:g3_firmware:15.11.0.17\(9502\)_cn:*:*:*:*:*:*:*

References

af854a3a-2127-422b-91ae-364da2661108

Last enrichment sync: 14-Oct-2026 09:21
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE-2021-27691 CYFIRMA Report Maps Cyber Threats Facing India and SAARC Telecom Sector

CVE (14)

Malware (3)

Threat Actors (33)

MITRE ATT&CK (13)

Vendors (15)

Products (13)

Tools (1)

Industries (14)

Countries (10)

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.