How severe is CVE-2013-1133?

CVE-2013-1133 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2013-1133 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-2013-1133?

CVE-2013-1133 primarily affects Cisco Unified Communications Manager. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-1133?

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-2013-1133 published?

CVE-2013-1133 was published on 2013-02-27 and last updated on 2026-06-16.

CVE-2013-1133

CVE-2013-1133 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-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Unified Communications Manager
Published: 2013-02-27
Last modified: 2026-06-16

Description

Cisco Unified Communications Manager (CUCM) 8.6 before 8.6(2a)su2, 8.6 BE3k before 8.6(4) BE3k, and 9.x before 9.0(1) allows remote attackers to cause a denial of service (CPU consumption and GUI and voice outages) via malformed packets to unused UDP ports, aka Bug ID CSCtx43337.

Frequently asked questions

What is CVE-2013-1133?: Cisco Unified Communications Manager (CUCM) 8.6 before 8.6(2a)su2, 8.6 BE3k before 8.6(4) BE3k, and 9.x before 9.0(1) allows remote attackers to cause a denial of service (CPU consumption and GUI and voice outages) via malformed packets to unused UDP ports, aka Bug ID CSCtx43337.
How severe is CVE-2013-1133?: CVE-2013-1133 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2013-1133 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-2013-1133?: CVE-2013-1133 primarily affects Cisco Unified Communications Manager. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-1133?: 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-2013-1133 published?: CVE-2013-1133 was published on 2013-02-27 and last updated on 2026-06-16.

References

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130227-cucm

Affected products (8)

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\(4\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager:9.0\(1\):*:*:*:*:*:*:*

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