CVE-2021-27854 describes a vulnerability in IEEE 802.1Q and 802.2 standards that allows Layer 2 network filtering, specifically IPv6 RA guard, to be bypassed through techniques like VLAN 0 headers and frame conversions between Ethernet and Wi-Fi. This medium-severity vulnerability (CVSS 4.7) has a low attack complexity and requires adjacent network access, potentially leading to information disclosure or denial of service, as highlighted by media coverage. While there are no known active exploits or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered some community discussion and media attention.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 802.2h-1997CPE matchmatch criteria | cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:* | ||
<= d1.0CPE matchmatch criteria | cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.