Vulnerability Monitor

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CVE-2009-2051

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.

Security Impact Summary

CVE-2009-2051 is a security vulnerability that . Impacting 3 products from cisco, from cisco, from cisco organizations running these solutions should prioritize assessment and patching.

Historical Context

Originally identified in 2009, this vulnerability predates many modern security frameworks and practices. The vulnerability landscape of that era was characterized by different threat models and less mature defense mechanisms compared to contemporary standards.

Published

2009-08-27T17:00:00.953

Last Modified

2026-04-23T00:35:47.467

Status

Modified

Source

[email protected]

Severity

CVSSv2: 7.8 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: COMPLETE

Exploitability Score

10.0

Impact Score

6.9

Weaknesses

Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	cisco	unified_communications_manager	< 5.1\(3g\)	Yes
Application	cisco	unified_communications_manager	< 6.1\(4\)	Yes
Application	cisco	unified_communications_manager	< 7.1\(2\)	Yes
Operating System	cisco	ios	≤ 12.4	Yes
Operating System	cisco	ios	≤ 15.1	Yes
Operating System	cisco	ios_xe	≤ 2.6.1	Yes

References

http://osvdb.org/57453 Broken Link ([email protected])
http://secunia.com/advisories/36498 Third Party Advisory ([email protected])
http://secunia.com/advisories/36499 Third Party Advisory ([email protected])
http://www.cisco.com/en/US/products/products_security_advisory09186a0080af2d11.shtml Patch, Vendor Advisory ([email protected])
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4a30f.shtml Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/36152 Third Party Advisory, VDB Entry ([email protected])
http://www.securitytracker.com/id?1022775 Third Party Advisory, VDB Entry ([email protected])
http://osvdb.org/57453 Broken Link (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/36498 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/36499 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.cisco.com/en/US/products/products_security_advisory09186a0080af2d11.shtml Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4a30f.shtml Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/36152 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id?1022775 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.