Resource exhaustion in Asterisk
CVE-2025-54995
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 resourc…
Vulnerability class: DoS (Denial of Service)
EPSS: 0.004 (35.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Asterisk — versions < 18.26.4, < 18.9-cert17
- Sangoma Asterisk
- Sangoma Certified_asterisk — versions 18.9
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-54995?
- CVE-2025-54995 is a medium-severity vulnerability in Asterisk, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2025-08-28.
- How severe is CVE-2025-54995?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2025-54995 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.