CVE-2025-47779: 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.
Classification
CVE ID: CVE-2025-47779
CVSS Base Severity: HIGH
CVSS Base Score: 7.7
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Problem Types
CWE-140: Improper Neutralization of Delimiters CWE-792: Incomplete Filtering of One or More Instances of Special ElementsAffected Products
Vendor: asterisk
Product: asterisk
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 9.18% (scored less or equal to compared to others)
EPSS Date: 2025-06-14 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-47779https://github.com/asterisk/asterisk/security/advisories/GHSA-2grh-7mhv-fcfw
https://github.com/asterisk/asterisk/blob/master/configs/samples/pjsip.conf.sample