CVE-2021-27707

9.8 criticalEPSS 2.8%

Critical (9.8) in tenda. EPSS 2.8% chance of exploitation in the next 30 days.

Buffer Overflow in Tenda G1 and G3 routers with firmware v15.11.0.17(9502)_CN allows remote attackers to execute arbitrary code via a crafted action/"portMappingIndex "request. This occurs because the "formDelPortMapping" function directly passes the parameter "portMappingIndex" to strcpy without limit.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 2.8% chance of exploitation in the next 30 days; higher than 86% of CVEs (scores of 2026-10-31)
CWE: CWE-120
Published: 2021-04-14
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

tenda:g1_firmware
tenda:g3_firmware

References

https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw
https://hackmd.io/U7OVgYIuRcOKV7SW5-euHw

Check your stack JSON