CVE-2009-0635 describes a memory leak vulnerability in the Cisco Tunneling Control Protocol (cTCP) encapsulation feature within Cisco IOS 12.4, specifically when an Easy VPN server is enabled. This flaw allows remote attackers to trigger a denial of service through memory exhaustion and device crashes by sending a sequence of TCP packets. With a CVSS score of 7.1, it is considered highly severe due to its remote attack vector, medium complexity, and complete availability impact. 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 |
|---|---|---|---|
12.4tCPE matchmatch criteria | cpe:2.3:o:cisco:ios:12.4t:*:*:*:*:*:*:* | ||
12.4xzCPE matchmatch criteria | cpe:2.3:o:cisco:ios:12.4xz:*:*:*:*:*:*:* | ||
12.4yaCPE matchmatch criteria | cpe:2.3:o:cisco:ios:12.4ya:*:*:*:*:*:*:* |
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.
Remediation records are not available for this CVE.