How severe is CVE-2009-0057?

CVE-2009-0057 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2009-0057 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-0057?

CVE-2009-0057 primarily affects Cisco Unified Communications Manager. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0057?

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

When was CVE-2009-0057 published?

CVE-2009-0057 was published on 2009-01-22 and last updated on 2026-06-16.

CVE-2009-0057

CVE-2009-0057 is a medium-severity vulnerability in Cisco Unified Communications Manager with a CVSS 2.0 base score of 4.3. 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-20.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Unified Communications Manager
Published: 2009-01-22
Last modified: 2026-06-16

Description

The Certificate Authority Proxy Function (CAPF) service in Cisco Unified Communications Manager 5.x before 5.1(3e) and 6.x before 6.1(3) allows remote attackers to cause a denial of service (voice service outage) by sending malformed input over a TCP session in which the "client terminates prematurely."

Frequently asked questions

What is CVE-2009-0057?: The Certificate Authority Proxy Function (CAPF) service in Cisco Unified Communications Manager 5.x before 5.1(3e) and 6.x before 6.1(3) allows remote attackers to cause a denial of service (voice service outage) by sending malformed input over a TCP session in which the "client terminates prematurely."
How severe is CVE-2009-0057?: CVE-2009-0057 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2009-0057 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-0057?: CVE-2009-0057 primarily affects Cisco Unified Communications Manager. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0057?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-0057 published?: CVE-2009-0057 was published on 2009-01-22 and last updated on 2026-06-16.

References

Affected products (36)

cpe:2.3:a:cisco:unified_communications_manager:5.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.0_1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.0_2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.0_3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.0_3a:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.0_4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.0_4a:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.0_4a_su1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1:\(1\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1:\(2\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1:\(2a\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1:\(2b\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1:\(3a\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1:5.1\(1\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1:5.1_\(2a\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1\(3c\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1_\(2a\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1_1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1_2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1_2a:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1_2b:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:5.1_3a:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.0:\(1\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.0:\(1a\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.0_1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.0_1a:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1:\(1a\):*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:6.1_1a:*:*:*:*:*:*:*

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