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CVE-2021-34991

HIGH CVSS: 8.8 Published: 2021-11-15 Modified: 2026-06-17

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6400v2 1.0.4.106_10.0.80 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the UPnP service, which listens on TCP port 5000 by default. When parsing the uuid request header, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-14110.

Affected Platforms

Netgear R6400V2Netgear R8000 FirmwareNetgear Rax15 FirmwareNetgear Rax200Netgear Rax45Netgear D6400 FirmwareNetgear R6700V3 FirmwareNetgear D6220 FirmwareNetgear Cax80 FirmwareNetgear R7850 Firmware

Weakness Type

CWE-121, CWE-787

References