---
id: CVE-2026-57194
title: >-
  Asterisk: chan_unistim DIALPAGE digit handling can overflow phone_number and
  crash Asterisk
summary: >-
  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, an out-of-bounds write in `chan_unistim` `DIALPAGE`
  digit handl…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: asterisk
product: asterisk
affected:
  - asterisk < 20.20.1
  - 'asterisk >= 21.0.0-pre1, < 21.12.3'
  - 'asterisk >= 22.0.0-pre1, < 22.10.1'
  - 'asterisk >= 23.0.0-pre1, < 23.4.1'
  - certified-asterisk < 20.7-cert11
  - 'certified-asterisk >= 22.8-cert1-pre1, < 22.8-cert3'
published: '2026-10-27'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T16:52:47.225Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-57194'
references:
  - url: >-
      https://github.com/asterisk/asterisk/security/advisories/GHSA-3g56-cgrh-95p5
    label: >-
      https://github.com/asterisk/asterisk/security/advisories/GHSA-3g56-cgrh-95p5
  - url: >-
      https://github.com/asterisk/asterisk/commit/430f423c84e4e32a462d907632b66c9793236e96
    label: >-
      https://github.com/asterisk/asterisk/commit/430f423c84e4e32a462d907632b66c9793236e96
  - url: >-
      https://github.com/asterisk/asterisk/commit/6da8e10c210d8e014c27c67235252e1dfc794446
    label: >-
      https://github.com/asterisk/asterisk/commit/6da8e10c210d8e014c27c67235252e1dfc794446
  - url: >-
      https://github.com/asterisk/asterisk/commit/6f414ec771eaa3318a4b2d28f70fa387196ae283
    label: >-
      https://github.com/asterisk/asterisk/commit/6f414ec771eaa3318a4b2d28f70fa387196ae283
  - url: >-
      https://github.com/asterisk/asterisk/commit/ce6e2233599b76bc30c33b4816b15609c8ddc8b6
    label: >-
      https://github.com/asterisk/asterisk/commit/ce6e2233599b76bc30c33b4816b15609c8ddc8b6
  - url: >-
      https://github.com/asterisk/asterisk/commit/d803b5370b05f39a6241b2556eb9894b02148e6a
    label: >-
      https://github.com/asterisk/asterisk/commit/d803b5370b05f39a6241b2556eb9894b02148e6a
  - url: >-
      https://github.com/asterisk/asterisk/commit/fc3a1cb3c386c962bfca8cd9d533d1390d4ad933
    label: >-
      https://github.com/asterisk/asterisk/commit/fc3a1cb3c386c962bfca8cd9d533d1390d4ad933
  - url: >-
      https://github.com/asterisk/asterisk/commit/ff65e4b0867bee12cdcb3a6219b976ee7ee08963
    label: >-
      https://github.com/asterisk/asterisk/commit/ff65e4b0867bee12cdcb3a6219b976ee7ee08963
  - url: 'https://github.com/asterisk/asterisk/releases/tag/20.20.1'
    label: 'https://github.com/asterisk/asterisk/releases/tag/20.20.1'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/21.12.3'
    label: 'https://github.com/asterisk/asterisk/releases/tag/21.12.3'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/22.10.1'
    label: 'https://github.com/asterisk/asterisk/releases/tag/22.10.1'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/23.4.1'
    label: 'https://github.com/asterisk/asterisk/releases/tag/23.4.1'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11'
    label: 'https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11'
  - url: 'https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3'
    label: 'https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3'
  - url: 'https://github.com/asterisk/asterisk/tree/24.0.0-pre1'
    label: 'https://github.com/asterisk/asterisk/tree/24.0.0-pre1'
tags:
  - cve.org
ingestedAt: '2026-10-27T17:33:23.793Z'
---

## Overview

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, an out-of-bounds write in `chan_unistim` `DIALPAGE` digit handling can overflow the `phone_number` field and crash Asterisk when an attacker sends a carefully crafted incoming request packet. The `chan_unistim` module must be loaded and configured with a valid `UNISTIM UDP port` that the attacker can reach. The attacker must register as a configured `phone MAC`, or the deployment must have an equivalent `production/autoprovisioning` path that allows the client to reach the main page. 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.

## Affected

- `asterisk < 20.20.1`
- `asterisk >= 21.0.0-pre1, < 21.12.3`
- `asterisk >= 22.0.0-pre1, < 22.10.1`
- `asterisk >= 23.0.0-pre1, < 23.4.1`
- `certified-asterisk < 20.7-cert11`
- `certified-asterisk >= 22.8-cert1-pre1, < 22.8-cert3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.