CVE-2011-2560

CVE-2011-2560 is a high-severity vulnerability in Cisco Unified Communications Manager with a CVSS 2.0 base score of 7.8. 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-399.

Key facts

• Severity: High (CVSS 2.0 base score 7.8)
• EPSS exploit prediction: 2% (75th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Cisco Unified Communications Manager
• Published: 2011-08-29
• Last modified: 2026-06-16

Description

The Packet Capture Service in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x does not properly handle idle TCP connections, which allows remote attackers to cause a denial of service (memory consumption and restart) by making many connections, aka Bug ID CSCtf97162.

Frequently asked questions

What is CVE-2011-2560?

The Packet Capture Service in Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x does not properly handle idle TCP connections, which allows remote attackers to cause a denial of service (memory consumption and restart) by making many connections, aka Bug ID CSCtf97162.

How severe is CVE-2011-2560?

CVE-2011-2560 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2011-2560 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2560?

CVE-2011-2560 primarily affects Cisco Unified Communications Manager. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2560?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2011-2560 published?

CVE-2011-2560 was published on 2011-08-29 and last updated on 2026-06-16.

References

• http://www.cisco.com/en/US/products/products_security_advisory09186a0080b8f531.shtml

Affected products (14)

• cpe:2.3:a:cisco:unified_communications_manager:4.1\(3\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.1\(3\)sr1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.1\(3\)sr2:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.1\(3\)sr3:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.1\(3\)sr4:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.2:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.2.3:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.2.3sr1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.2.3sr2:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.2.3sr2b:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.3:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:4.3\(1\):*:*:*:*:*:*:*

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