TI-2021-17579 Aliases CVE-2021-40546 GHSA-mf93-hqq3-h8xg

Tenda AC6 US_AC6V4.0RTL_V02.03.01.26_cn.bin allows attackers (who have the administrator…

MEDIUM 56CWE-404Published 2023-09-05 · Updated 2024-10-01

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-404.

Summary

Tenda AC6 US_AC6V4.0RTL_V02.03.01.26_cn.bin allows attackers (who have the administrator password) to cause a denial of service (device crash) via a long string in the wifiPwd_5G parameter to /goform/setWifi.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.0073 54th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:tenda:ac6_firmware:02.03.01.26:::::::*	02.03.01.26	Vulnerable	Tenda
cpe:2.3:h:tenda:ac6:4.0:::::::*	4.0	Running on	Tenda

cpe:2.3:o:tenda:ac6_firmware:02.03.01.26:*:*:*:*:*:*:* Versions 02.03.01.26 Vulnerable ·Tenda
cpe:2.3:h:tenda:ac6:4.0:*:*:*:*:*:*:* Versions 4.0 Running on ·Tenda

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-40546
2026-10-03 Alias added: GHSA-mf93-hqq3-h8xg

References

Exploit 1

https://github.com/doudoudedi/buffer_overflow/blob/main/Tenda%20AC6%20V4.0-Denial%20of%20Service%20Vulnerability.md

TI-2025-20961 Tenda AC6 v15.03.05.16 was discovered to contain a buffer overflow via the formSetSpeedWan function. CVSS 3.1CRITICAL 9.8
TI-2023-20197 Tenda AC10 V1.0 V15.03.06.23, AC1206 V15.03.06.23, AC8 v4 V16.03.34.06, AC6 V2.0… CVSS 3.1CRITICAL 9.8
TI-2023-20196 Tenda AC10 V1.0 V15.03.06.23, AC1206 V15.03.06.23, AC6 V2.0 V15.03.06.23, AC7 V1.0… CVSS 3.1CRITICAL 9.8
TI-2023-20193 Tenda AC6 V2.0 V15.03.06.23, AC7 V1.0 V15.03.06.44, F1203 V2.0.1.6, AC5 V1.0… CVSS 3.1CRITICAL 9.8
TI-2023-20191 Tenda AC10 V1.0 V15.03.06.23, AC1206 V15.03.06.23, AC8 v4 V16.03.34.06, AC6 V2.0… CVSS 3.1CRITICAL 9.8
TI-2023-20109 Buffer Overflow vulnerability in Tenda Ac19 v.1.0, AC18, AC9 v.1.0, AC6 v.2.0 and v.1.0… CVSS 3.1CRITICAL 9.8

See all 107 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences