Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Netgear | Ex3700 Firmware | < 1.0.0.94 |
| Netgear | Ex3700 | - |
| Netgear | Ex3800 Firmware | < 1.0.0.94 |
| Netgear | Ex3800 | - |
| Netgear | Ex6120 Firmware | < 1.0.0.66 |
| Netgear | Ex6120 | - |
| Netgear | Ex6130 Firmware | < 1.0.0.66 |
| Netgear | Ex6130 | - |
| Netgear | R6400 Firmware | < 1.0.1.76 |
| Netgear | R6400 | - |
| Netgear | R6400V2 Firmware | < 1.0.4.120 |
| Netgear | R6400V2 | - |
| Netgear | R6700V3 Firmware | < 1.0.4.120 |
| Netgear | R6700V3 | - |
| Netgear | R6900P Firmware | < 1.3.3.142 |
| Netgear | R6900P | - |
| Netgear | R7000 Firmware | < 1.0.11.128 |
| Netgear | R7000 | - |
| Netgear | R7000P Firmware | < 1.3.3.142 |
| Netgear | R7000P | - |
Related Weaknesses (CWE)
References
- https://kb.netgear.com/000064361/Security-Advisory-for-Pre-Authentication-BufferVendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-1303/Third Party AdvisoryVDB Entry
- https://kb.netgear.com/000064361/Security-Advisory-for-Pre-Authentication-BufferVendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-1303/Third Party AdvisoryVDB Entry
FAQ
What is CVE-2021-34991?
CVE-2021-34991 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 vu...
How severe is CVE-2021-34991?
CVE-2021-34991 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-34991?
Check the references section above for vendor advisories and patch information. Affected products include: Netgear Ex3700 Firmware, Netgear Ex3700, Netgear Ex3800 Firmware, Netgear Ex3800, Netgear Ex6120 Firmware.