CVE-2021-34767 is a high-severity denial-of-service vulnerability affecting Cisco IOS XE Wireless Controller Software on Catalyst 9000 Family Wireless Controllers. A logic error in IPv6 traffic processing allows an unauthenticated, adjacent attacker to cause a Layer 2 loop in a configured VLAN by sending a crafted IPv6 packet, leading to traffic drops. The vulnerability has a CVSS score of 7.4 (High) due to its low attack complexity and significant impact on availability, requiring only adjacent network access. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
Range not provided by sourceCPE matchmatch criteria | cpe:2.3:o:cisco:ios_xe:-:*:*:*:*:*:*:* | ||
3.15.1xbsCPE matchmatch criteria | cpe:2.3:o:cisco:ios_xe:3.15.1xbs:*:*:*:*:*:*:* | ||
3.15.2xbsCPE matchmatch criteria | cpe:2.3:o:cisco:ios_xe:3.15.2xbs:*:*:*:*:*:*:* | ||
16.7.1CPE matchmatch criteria | cpe:2.3:o:cisco:ios_xe:16.7.1:*:*:*:*:*:*:* | ||
16.7.1aCPE matchmatch criteria | cpe:2.3:o:cisco:ios_xe:16.7.1a:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/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.