CVE-2021-27692

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-04-16 · updated 2026-06-17
Weakness: CWE-78

Description

Command Injection in 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/umountUSBPartition" request. This occurs because the "formSetUSBPartitionUmount" function executes the "doSystemCmd" function with untrusted input.

Affected products

Tendacn G1 Firmware: 15.11.0.16(9024)_cn, 15.11.0.17(9502)_cn
Tendacn G3 Firmware: 15.11.0.16(9024)_cn, 15.11.0.17(9502)_cn

References

https://hackmd.io/%40aZYpdinUS2SD-yhAeHwOkw/ry-t4QfMu
https://hackmd.io/%40aZYpdinUS2SD-yhAeHwOkw/ry-t4QfMu

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