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 resource exhaustion. This issue has been patched in versions 18.26.4 and 18.9-cert17.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (39.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
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
- github.com/asterisk/asterisk/security/advisories/GHSA-557q-795j-wfx2 (Exploit, Vendor Advisory)
- github.com/asterisk/asterisk/pull/1405 (Issue Tracking)
- github.com/asterisk/asterisk/pull/1406 (Issue Tracking)
- github.com/asterisk/asterisk/commit/0278f5bde14565c6838a6ec39bc21aee0cde56a9 (Patch)
- github.com/asterisk/asterisk/commit/eafcd7a451dcd007dddf324ac37dd55a4808338d (Patch)
- 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.