CVE-2009-5039

Severity: medium (CVSS 5.0 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-01-07 · updated 2026-06-16
Weakness: CWE-772

Description

Memory leak in the gk_circuit_info_do_in_acf function in the H.323 implementation in Cisco IOS before 15.0(1)XA allows remote attackers to cause a denial of service (memory consumption) via a large number of calls over a long duration, as demonstrated by InterZone Clear Token (IZCT) test traffic, aka Bug ID CSCsz72535.

Affected products

Cisco IOS: before 15.0\(1\)xa — fixed in 15.0\(1\)xa

How to fix

Upgrade to a fixed version: Cisco IOS 15.0\(1\)xa. Check the vendor advisory for mitigations.

References

http://www.cisco.com/en/US/docs/ios/15_0/15_0x/15_01_XA/rn800xa.pdf
https://exchange.xforce.ibmcloud.com/vulnerabilities/64731
http://www.cisco.com/en/US/docs/ios/15_0/15_0x/15_01_XA/rn800xa.pdf
https://exchange.xforce.ibmcloud.com/vulnerabilities/64731

Get alerted when CVE-2009-5039 or the next vulnerability affects your stack