CVE-2025-47779 Using malformed From header can forge identity with ";" or NULL in name portion

High 7.7 Published 22 May 2025 Updated 3 Nov 2025

Authenticated attackers can spoof user identities in SIP MESSAGE requests to send spam and facilitate social engineering attacks.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2025-47779?

CVE-2025-47779 is a high-severity vulnerability in asterisk, published on 22 May 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-792, CWE-140

Which versions are affected by CVE-2025-47779?

It affects 2 products.

Products include Sangoma Asterisk, Sangoma Certified Asterisk.

How do I fix CVE-2025-47779?

Upgrade to a fixed version.

Is CVE-2025-47779 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-47779 exists.

Sources

Also known as DEBIAN-CVE-2025-47779, GHSA-2grh-7mhv-fcfw, UBUNTU-CVE-2025-47779.