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Vulnerabilities

Vulnerability · CVE-2025-47779

Asterisk is an open-source private branch exchange (PBX).

Published May 22, 2025 · catalog updated Nov 3, 2025 · Asterisk is an open-source

Check if you run it

No confirmed exploitation is on record for CVE-2025-47779. EPSS is 0.51%. Act only if a listed version of Asterisk is an open-source is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Asterisk is an open-source).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.51%
Remediation
Version ranges on file
Affected products
vendor asterisk asterisk 21.0, < 21.9.1

Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authentication do not get proper alignment. An authenticated attacker can spoof any user identity to send spam messages to the user with their authorization token. Abuse of this security issue allows authenticated attackers to send fake chat messages can be spoofed to appear to come from trusted entities. Even administrators who follow Security best practices and Se

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor asterisk asterisk 21.0, < 21.9.121.0, < 21.9.1

How to fix CVE-2025-47779

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-47779. EPSS is 0.51%. Act only if a listed version of Asterisk is an open-source is installed.

Which versions are affected?

Compare what you have installed with asterisk asterisk 21.0, < 21.9.1 21.0, < 21.9.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 22, 2025 · EUVD

    Detected

    Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authentication do not get proper alignment. An authenticated attacker can spoof any user identity to send spam messages to the user with their authorization token. Abus

  2. Nov 3, 2025 · EUVD

    Updated

    Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authentication do not get proper alignment. An authenticated attacker can spoof any user identity to send spam messages to the user with their authorization token. Abus

Sources

  • CVE.orgVulnerability recordCVE-2025-47779

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-47779

    30-day exploitation probability 0.5%

    first.org
  • EUVDVulnerability recordEUVD-2025-16166

    Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.26.2, 20.14.1, 21.9.1, and 22.4.1 of Asterisk and versions 18.9-cert14 and 20.7-cert5 of certified-asterisk, SIP requests of the type MESSAGE (RFC 3428) authentication do not get proper alignment. An a

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.