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CVE-2026-57195EUVD-2026-111393GHSA-3RHJ-HHW7-M6FW

Asterisk: NULL Pointer Dereference in HTTP AMI Digest Authentication

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 20.20.1, 21.12.3, 22.10.1, 23.4.1, 20.7-cert11, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

Asterisk, an open source telephony toolkit (private branch exchange), and Certified Asterisk are affected when AMI is accessed over HTTP with Digest Authentication. An unauthenticated attacker who can reach the HTTP server could crash Asterisk, though the HTTP server, AMI, and AMI-over-HTTP must all be enabled, and by default the server only listens on the local machine.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original description

Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, a NULL pointer dereference in the `Asterisk Manager Interface (AMI)` may allow an unauthenticated attacker to crash Asterisk when `Digest Authentication` is used via `HTTP`. The Asterisk `HTTP` web server, AMI, and AMI access via `HTTP` must all be enabled; each is disabled by default. The attacker must be able to connect to the `HTTP` server, which binds only to `127.0.0.1` by default even when enabled. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.

Timeline

  1. CVE published
  2. First seen by cve.now

Affected versions

  • asterisk asterisk

    fixed in 20.20.1; From 21.0.0-pre1 · fixed in 21.12.3; From 22.0.0-pre1 · fixed in 22.10.1; From 23.0.0-pre1 · fixed in 23.4.1

  • asterisk certified-asterisk

    fixed in 20.7-cert11; From 22.8-cert1-pre1 · fixed in 22.8-cert3

References 15

GitHub · asterisk/asterisk