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Fencer Vulns
medium 6.5

CVE-2025-54995 json

Asterisk remotely exploitable leak of RTP UDP ports and internal resources

published 2025-08-28 14 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-26134

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

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.

Patch / fix

  • asterisk certified_asterisk 18.9-cert17, 18.26.4
  • asterisk open_source 18.9-cert17, 18.26.4
  • digium asterisk 18.9-cert17, 18.26.4
  • digium certified_asterisk 18.9-cert17, 18.26.4
  • sangoma certified_asterisk 18.9-cert17, 18.26.4
  • asterisk Debian 14 1:22.2.0~dfsg+~cs6.15.60671435-1

debian advisories DEBIAN-CVE-2025-54995

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-54995 updated cvss 4.3

asterisk: Asterisk resource exhaustion

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
14 mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/asterisk/asterisk/security/advisories/GHSA-557q-795j-wfx2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • asterisk asterisk

Classification

Weakness
  • CWE-1286 Improper Validation of Syntactic Correctness of Input
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.