Is CVE-2009-2051 being actively exploited?

CVE-2009-2051 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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

CVE-2009-2051 has a CVSS 2.0 base score of 7.8 (HIGH).

CVE-2009-2051

HIGH · CVSS 7.8EPSS 3.4%EU EUVD

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.

Key facts

CVSS score: 7.8 (v2.0)
Severity: HIGH
CVSS vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
EPSS score: 3.4% (89th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2009-2047)
Published: August 27, 2009
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2009-2047 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

cisco / ios
cisco / ios xe
cisco / unified communications manager

References

http://osvdb.org/57453(Broken Link)
http://secunia.com/advisories/36498(Third Party Advisory)
http://secunia.com/advisories/36499(Third Party Advisory)
http://www.cisco.com/en/US/products/products_security_advisory09186a0080af2d11.shtml(Patch, Vendor Advisory)
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4a30f.shtml(Vendor Advisory)
http://www.securityfocus.com/bid/36152(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id?1022775(Third Party Advisory, VDB Entry)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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