CVE-2009-0635

Name: CVE-2009-0635
Creator: NVD / NIST
Published: 2009-03-27T16:30:02.077+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.51%

Last modified Jun 16, 2026

CVE-2009-0635 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 2.51% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

2.51%

82.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-399

Affected Software

Vendor	Product	Versions
Cisco	Ios	12.4t
Cisco	Ios	12.4xz
Cisco	Ios	12.4ya

References

http://secunia.com/advisories/34438Vendor Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90459.shtmlPatch, Vendor Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtmlPatch, Vendor Advisory
http://www.securityfocus.com/bid/34246
http://www.securitytracker.com/id?1021895
http://www.vupen.com/english/advisories/2009/0851Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/49417
http://secunia.com/advisories/34438Vendor Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90459.shtmlPatch, Vendor Advisory
http://www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtmlPatch, Vendor Advisory
http://www.securityfocus.com/bid/34246
http://www.securitytracker.com/id?1021895
http://www.vupen.com/english/advisories/2009/0851Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/49417

Timeline

Published: Mar 27, 2009
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-0635?

How severe is CVE-2009-0635?

Severity scoring for CVE-2009-0635 is pending analysis. The EPSS model estimates a 2.51% probability of exploitation in the next 30 days.

How do I fix CVE-2009-0635?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-0635?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST