Is CVE-2009-2052 in the CISA KEV catalog?

No. CVE-2009-2052 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-2052?

CVE-2009-2052 has a CVSS v2 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2009-2052?

CVE-2009-2052 has an EPSS score of 3.98% (89th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-2052?

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

CVE & CISA-KEV Catalog

CVE-2009-2052

HIGHEPSS 89th pctl

7.8

CVSS v2

NVD

Description

Cisco Unified Communications Manager (aka CUCM, formerly CallManager) 4.x, 5.x before 5.1(3g), 6.x before 6.1(4), 7.0 before 7.0(2), and 7.1 before 7.1(2); and Cisco Unified Presence 1.x, 6.x before 6.0(6), and 7.x before 7.0(4); allows remote attackers to cause a denial of service (TCP services outage) via a large number of TCP connections, related to "tracking of network connections," aka Bug IDs CSCsq22534 and CSCsw52371.

How to fix

Remediation Available

unified communications managerNVD

Affected:>= 7.1, < 7.1(2)Fixed in:7.1(2)CVE-2009-2052derived 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

3.98%probability of exploitation in 30 days

89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Patch1

cisco.com

Vendor Advisory3

Third-Party Advisory6

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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.