How severe is CVE-2009-5039?

CVE-2009-5039 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-5039 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-5039?

CVE-2009-5039 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-5039?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-5039 published?

CVE-2009-5039 was published on 2011-01-07 and last updated on 2026-06-16.

CVE-2009-5039

CVE-2009-5039 is a medium-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-772.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-772
Affected product: Cisco Ios
Published: 2011-01-07
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2009-5039?: 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.
How severe is CVE-2009-5039?: CVE-2009-5039 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-5039 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-5039?: CVE-2009-5039 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-5039?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-5039 published?: CVE-2009-5039 was published on 2011-01-07 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

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