CVE-2021-34991

high-risk
Published 2021-11-15

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.

Do I need to act?

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0.29% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
ADJACENT_NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Netgear

References (4)

Vendor Advisory https://kb.netgear.com/000064361/Security-Advisory-for-Pre-Authentication-Buffer...
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-1303/
Vendor Advisory https://kb.netgear.com/000064361/Security-Advisory-for-Pre-Authentication-Buffer...
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-1303/
53
/ 100
high-risk
Severity 27/34 · High
Exploitability 1/34 · Minimal
Exposure 25/34 · High