CVE-2021-27707

PoC —

CVSS 3.1

9.8 critical

EPSS

3%p86

Published

Apr 14, 2021 (Apr 14, 2021)

Modified

Jun 17, 2026

Description

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.

Vendors: tenda
Products: g1 firmware, g3 firmware
Weakness: CWE-120
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (2.8%)

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