Is CVE-2009-2051 in the CISA KEV catalog?

No. CVE-2009-2051 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-2051?

CVE-2009-2051 has a CVSS v2 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2009-2051?

CVE-2009-2051 has an EPSS score of 3.44% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-2051?

Upgrade unified communications manager to 7.1(2) or later.

CVE & CISA-KEV Catalog

CVE-2009-2051

HIGHEPSS 88th pctl

7.8

CVSS v2

NVD

Description

Cisco IOS 12.2 through 12.4 and 15.0 through 15.1, Cisco IOS XE 2.5.x and 2.6.x before 2.6.1, and Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x, 5.x before 5.1(3g), 6.x before 6.1(4), and 7.x before 7.1(2) allow remote attackers to cause a denial of service (device reload or voice-services outage) via a malformed SIP INVITE message that triggers an improper call to the sipSafeStrlen function, aka Bug IDs CSCsz40392 and CSCsz43987.

How to fix

Remediation Available

unified communications managerNVD

Affected:>= 7.1, < 7.1(2)Fixed in:7.1(2)CVE-2009-2051derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.44%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Patch1

cisco.com

Vendor Advisory1

cisco.com

Third-Party Advisory4

Other references1

osvdb.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.