Asterisk: LDAP Filter Injection in res_config_ldap via SIP Username (Unauthenticated Information Disclosure)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-57193
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-26 20:17:56 UTC
Updated2026-10-26 20:17:56 UTC
DescriptionAsterisk 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.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-943 | CWE-943 CWE-943: Improper Neutralization of Special Elements in Data Query Logic

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Asterisk Asterisk affected < 20.20.1 Not specified
CNA Asterisk Asterisk affected >= 21.0.0-pre1, < 21.12.3 Not specified
CNA Asterisk Asterisk affected >= 22.0.0-pre1, < 22.10.1 Not specified
CNA Asterisk Asterisk affected >= 23.0.0-pre1, < 23.4.1 Not specified
CNA Asterisk Certified-asterisk affected < 20.7-cert11 Not specified
CNA Asterisk Certified-asterisk affected >= 22.8-cert1-pre1, < 22.8-cert3 Not specified

References

ReferenceSourceLinkTags
github.com/asterisk/asterisk/commit/14968f2f440ea0dd983caa4f477237a52249... [email protected] github.com
github.com/asterisk/asterisk/commit/ef280572a034cac3994075298facb1999778... [email protected] github.com
github.com/asterisk/asterisk/releases/tag/22.10.1 [email protected] github.com
github.com/asterisk/asterisk/commit/7e1ae09594a101950398cc6aff2dd2e5ab31... [email protected] github.com
github.com/asterisk/asterisk/commit/04aa482212e43b292817444eb4de35499f4b... [email protected] github.com
github.com/asterisk/asterisk/releases/tag/20.20.1 [email protected] github.com
github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11 [email protected] github.com
github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3 [email protected] github.com
github.com/asterisk/asterisk/releases/tag/23.4.1 [email protected] github.com
github.com/asterisk/asterisk/releases/tag/21.12.3 [email protected] github.com
github.com/asterisk/asterisk/commit/dd0c768d9e9678e4cb1ed95689a254a61452... [email protected] github.com
github.com/asterisk/asterisk/tree/24.0.0-pre1 [email protected] github.com
github.com/asterisk/asterisk/commit/8170a6bfa75994e7617a8b9d7fe7a7140b70... [email protected] github.com
github.com/asterisk/asterisk/commit/23c01b6d359c5d85da725beea89e394a6c03... [email protected] github.com
github.com/asterisk/asterisk/security/advisories/GHSA-r6c2-hwc2-j4mp [email protected] github.com
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