---
id: CVE-2026-57193
title: >-
  Asterisk: LDAP Filter Injection in res_config_ldap via SIP Username
  (Unauthenticated Information Disclosure)
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, the LDAP realtime driver `res_config_ldap` may permit
  `LDAP fil…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-943
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: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T19:46:01.924Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-57193'
references:
  - url: >-
      https://github.com/asterisk/asterisk/security/advisories/GHSA-r6c2-hwc2-j4mp
    label: >-
      https://github.com/asterisk/asterisk/security/advisories/GHSA-r6c2-hwc2-j4mp
  - url: >-
      https://github.com/asterisk/asterisk/commit/04aa482212e43b292817444eb4de35499f4b1568
    label: >-
      https://github.com/asterisk/asterisk/commit/04aa482212e43b292817444eb4de35499f4b1568
  - url: >-
      https://github.com/asterisk/asterisk/commit/14968f2f440ea0dd983caa4f477237a5224904dd
    label: >-
      https://github.com/asterisk/asterisk/commit/14968f2f440ea0dd983caa4f477237a5224904dd
  - url: >-
      https://github.com/asterisk/asterisk/commit/23c01b6d359c5d85da725beea89e394a6c031c5d
    label: >-
      https://github.com/asterisk/asterisk/commit/23c01b6d359c5d85da725beea89e394a6c031c5d
  - url: >-
      https://github.com/asterisk/asterisk/commit/7e1ae09594a101950398cc6aff2dd2e5ab314884
    label: >-
      https://github.com/asterisk/asterisk/commit/7e1ae09594a101950398cc6aff2dd2e5ab314884
  - url: >-
      https://github.com/asterisk/asterisk/commit/8170a6bfa75994e7617a8b9d7fe7a7140b70cbe2
    label: >-
      https://github.com/asterisk/asterisk/commit/8170a6bfa75994e7617a8b9d7fe7a7140b70cbe2
  - url: >-
      https://github.com/asterisk/asterisk/commit/dd0c768d9e9678e4cb1ed95689a254a61452239b
    label: >-
      https://github.com/asterisk/asterisk/commit/dd0c768d9e9678e4cb1ed95689a254a61452239b
  - url: >-
      https://github.com/asterisk/asterisk/commit/ef280572a034cac3994075298facb1999778ee0d
    label: >-
      https://github.com/asterisk/asterisk/commit/ef280572a034cac3994075298facb1999778ee0d
  - 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: '2026-10-26T20:39:42.630Z'
epss: 0.01963
epssPercentile: 0.80239
---

## 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, the LDAP realtime driver `res_config_ldap` may permit `LDAP filter injection` through a `SIP username`, allowing an unauthenticated attacker to make arbitrary LDAP queries using carefully crafted SIP packets and disclose information. The `res_config_ldap` module must be loaded and configured to access an LDAP server, which is not the default. 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.