Vulnerability Description
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R6400 and R6700 firmware version 1.0.4.98 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the upnpd service, which listens on UDP port 1900 by default. A crafted MX header field in an SSDP message can trigger an overflow of a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-11851.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Netgear | D6220 Firmware | < 1.0.0.68 |
| Netgear | D6220 | - |
| Netgear | D6400 Firmware | < 1.0.0.102 |
| Netgear | D6400 | - |
| Netgear | D7000 Firmware | < 1.0.0.66 |
| Netgear | D7000 | v2 |
| Netgear | D8500 Firmware | < 1.0.3.60 |
| Netgear | D8500 | - |
| Netgear | Dc112A Firmware | < 1.0.0.54 |
| Netgear | Dc112A | - |
| Netgear | Ex7000 Firmware | < 1.0.1.94 |
| Netgear | Ex7000 | - |
| Netgear | Ex7500 Firmware | < 1.0.0.72 |
| Netgear | Ex7500 | - |
| Netgear | R6250 Firmware | < 1.0.4.48 |
| Netgear | R6250 | - |
| Netgear | R6300 Firmware | < 1.0.4.50 |
| Netgear | R6300 | v2 |
| Netgear | R6400 Firmware | < 1.0.1.68 |
| Netgear | R6400 | - |
Related Weaknesses (CWE)
References
- https://kb.netgear.com/000062820/Security-Advisory-for-Stack-based-Buffer-OverflVendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-206/Third Party AdvisoryVDB Entry
- https://kb.netgear.com/000062820/Security-Advisory-for-Stack-based-Buffer-OverflVendor Advisory
- https://www.zerodayinitiative.com/advisories/ZDI-21-206/Third Party AdvisoryVDB Entry
FAQ
What is CVE-2021-27239?
CVE-2021-27239 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 R6400 and R6700 firmware version 1.0.4.98 routers. Authentication is not required to...
How severe is CVE-2021-27239?
CVE-2021-27239 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-2021-27239?
Check the references section above for vendor advisories and patch information. Affected products include: Netgear D6220 Firmware, Netgear D6220, Netgear D6400 Firmware, Netgear D6400, Netgear D7000 Firmware.