CVE-2015-4199 describes a race condition in the IPv6-to-IPv4 functionality of Cisco IOS 15.3S, specifically within the Performance Routing Engine (PRE) module on UBR devices. This vulnerability allows remote attackers to trigger a denial of service by causing a NULL pointer free and module crash through intermittent connectivity with numerous IPv6 CPE devices. With a CVSS score of 7.1, it is considered high severity, requiring medium attack complexity (AC:M) but no authentication (Au:N), leading to a complete loss of availability (A:C). There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
15.3sCPE matchmatch criteria | cpe:2.3:o:cisco:ios:15.3s:*:*:*:*:*:*:* |
CVSS version used by this source: 2.0
AV:N/AC:M/Au:N/C:N/I:N/A:C
No social media mentions found for this CVE.
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 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.