CVE-2013-3461

CVE-2013-3461 is a high-severity vulnerability in Cisco Unified Communications Manager with a CVSS 2.0 base score of 7.1. 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 7.1)
• EPSS exploit prediction: 1% (68th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Cisco Unified Communications Manager
• Published: 2013-08-25
• Last modified: 2026-06-16

Description

Cisco Unified Communications Manager (Unified CM) 8.5(x) and 8.6(x) before 8.6(2a)su3 and 9.x before 9.1(1) does not properly restrict the rate of SIP packets, which allows remote attackers to cause a denial of service (memory and CPU consumption, and service disruption) via a flood of UDP packets to port 5060, aka Bug ID CSCub35869.

Frequently asked questions

What is CVE-2013-3461?

Cisco Unified Communications Manager (Unified CM) 8.5(x) and 8.6(x) before 8.6(2a)su3 and 9.x before 9.1(1) does not properly restrict the rate of SIP packets, which allows remote attackers to cause a denial of service (memory and CPU consumption, and service disruption) via a flood of UDP packets to port 5060, aka Bug ID CSCub35869.

How severe is CVE-2013-3461?

CVE-2013-3461 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2013-3461 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-3461?

CVE-2013-3461 primarily affects Cisco Unified Communications Manager. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-3461?

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-2013-3461 published?

CVE-2013-3461 was published on 2013-08-25 and last updated on 2026-06-16.

References

• http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130821-cucm
• http://www.securitytracker.com/id/1028938

Affected products (15)

• cpe:2.3:a:cisco:unified_communications_manager:9.0\(1\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.5:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\)su1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\)su2:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\)su3:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\)su4:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.5\(1\)su5:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.6:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.6\(1\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.6\(1a\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.6\(2\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.6\(2a\):*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.6\(2a\)su1:*:*:*:*:*:*:*
• cpe:2.3:a:cisco:unified_communications_manager:8.6\(2a\)su2:*:*:*:*:*:*:*

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• CVE-2015-0333 — Critical (CVSS 10.0): Adobe Flash Player before 13.0.0.277 and 14.x through 17.x before 17.0.0.134 on Windows and OS X and before…
• CVE-2014-4121 — Critical (CVSS 10.0): Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, 4.5, 4.5.1, and 4.5.2 does not properly parse internationalized…
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