Using malformed From header can forge identity with ";" or NULL in name portion

Description

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 Security Considerations can be impacted. Therefore, abuse can lead to spam and enable social engineering, phishing and similar attacks. 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 fix the issue.

Scores

EPSS (exploitation in 30 days)

0.53% · top 55% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: poc · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.7.

Weakness

• CWE-140: Improper Neutralization of Delimiters (opens in a new tab)All about CWE-140 and its CVEs
• CWE-792: Incomplete Filtering of One or More Instances of Special Elements (opens in a new tab)All about CWE-792 and its CVEs

Affected products

• asterisk · asterisk

  • affected < 18.9-cert14
  • affected >= 18.10, < 18.26.2
  • affected >= 20.0, < 20.7-cert5
  • affected >= 20.8, < 20.14.1
  • affected >= 21.0, < 21.9.1
  • affected >= 22.0, < 22.4.1

References (3)

• https://github.com/asterisk/asterisk/security/advisories/GHSA-2grh-7mhv-fcfw (opens in a new tab)x_refsource_CONFIRM
• https://github.com/asterisk/asterisk/blob/master/configs/samples/pjsip.conf.sample (opens in a new tab)x_refsource_MISC
• https://lists.debian.org/debian-lts-announce/2025/06/msg00003.html (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-47779](https://trackcve.app/badge/CVE-2025-47779.svg)](https://trackcve.app/cve/CVE-2025-47779)

Record last updated 3 Nov 2025, 20:04 UTC.