High severity8.8NVD Advisory· Published Nov 15, 2021· Updated Jun 17, 2026
CVE-2021-34991
CVE-2021-34991
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.
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Affected products
46Patches
Vulnerability mechanics
References
2- kb.netgear.com/000064361/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Multiple-Products-PSV-2021-0168nvdVendor Advisory
- www.zerodayinitiative.com/advisories/ZDI-21-1303/nvdThird Party AdvisoryVDB Entry
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