CVE-2009-0635

N/A Unknown
Published: March 27, 2009 Modified: April 23, 2026
View on NVD

Description

Memory leak in the Cisco Tunneling Control Protocol (cTCP) encapsulation feature in Cisco IOS 12.4, when an Easy VPN (aka EZVPN) server is enabled, allows remote attackers to cause a denial of service (memory consumption and device crash) via a sequence of TCP packets.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
http://secunia.com/advisories/34438
Source: psirt@cisco.com
Vendor Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90459.shtml
Source: psirt@cisco.com
Patch Vendor Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml
Source: psirt@cisco.com
Patch Vendor Advisory
http://www.securityfocus.com/bid/34246
Source: psirt@cisco.com
http://www.securitytracker.com/id?1021895
Source: psirt@cisco.com
http://www.vupen.com/english/advisories/2009/0851
Source: psirt@cisco.com
Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/49417
Source: psirt@cisco.com
http://secunia.com/advisories/34438
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90459.shtml
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Vendor Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml
Source: af854a3a-2127-422b-91ae-364da2661108
Patch Vendor Advisory
http://www.securityfocus.com/bid/34246
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.securitytracker.com/id?1021895
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.vupen.com/english/advisories/2009/0851
Source: af854a3a-2127-422b-91ae-364da2661108
Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/49417
Source: af854a3a-2127-422b-91ae-364da2661108

14 reference(s) from NVD

Quick Stats

CVSS v3 Score
N/A / 10.0
EPSS (Exploit Probability)
1.4%
81th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

CWE-399

Affected Vendors

cisco

Related CVEs

CVE-2026-7002 7.3
CVE-2026-7001 2.4
CVE-2026-7000 2.4
CVE-2026-6999 2.4
CVE-2026-6998 2.4