Advisory Details

November 11th, 2021

NETGEAR R6400v2 UPnP uuid Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2021-34991
CVSS SCORE	8.8, AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	NETGEAR
AFFECTED PRODUCTS	R6400v2
VULNERABILITY DETAILS	This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6400v2 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.
ADDITIONAL DETAILS	NETGEAR has issued an update to correct this vulnerability. More details can be found at: https://kb.netgear.com/000064361/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Multiple-Products-PSV-2021-0168
DISCLOSURE TIMELINE	2021-07-07 - Vulnerability reported to vendor 2021-11-11 - Coordinated public release of advisory 2021-12-23 - Advisory Updated
CREDIT	anonymous

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