CVE-2021-27239
high-risk
Published 2021-03-29
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.
Do I need to act?
~
2.6% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
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
References (4)
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-206/
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-206/
56
/ 100
high-risk
Severity
27/34 · High
Exploitability
6/34 · Minimal
Exposure
23/34 · High