CVE-2021-27239 is a critical stack-based buffer overflow vulnerability affecting NETGEAR R6400 and R6700 routers running firmware version 1.0.4.98. This flaw resides in the upnpd service, allowing unauthenticated, network-adjacent attackers to execute arbitrary code with root privileges by sending a specially crafted SSDP message. With a CVSS score of 8.8 (HIGH), the vulnerability presents a significant risk due to its low attack complexity and complete compromise potential. While no public exploit code or active exploitation has been observed, and community discussion is minimal, the high severity warrants immediate patching for affected devices.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.0.0.68CPE matchmatch criteria | cpe:2.3:o:netgear:d6220_firmware:*:*:*:*:*:*:*:* | ||
< 1.0.0.102CPE matchmatch criteria | cpe:2.3:o:netgear:d6400_firmware:*:*:*:*:*:*:*:* | ||
< 1.0.0.66CPE matchmatch criteria | cpe:2.3:o:netgear:d7000_firmware:*:*:*:*:*:*:*:* | ||
< 1.0.3.60CPE matchmatch criteria | cpe:2.3:o:netgear:d8500_firmware:*:*:*:*:*:*:*:* | ||
< 1.0.0.54CPE matchmatch criteria | cpe:2.3:o:netgear:dc112a_firmware:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.