Asterisk: Heap-use-after-free in Asterisk PJSIP TCP/SDP handling when TCP connection closes during SDP processing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-57187
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, an authenticated attacker may cause a heap-use-after-free in `PJSIP TCP/SDP` handling by sending a `SIP INVITE` over a connection-oriented transport and disconnecting before Asterisk responds with the `200 OK`. So far, the crash has only been reproduced when Asterisk is built with `Address Sanitizer`, which detects the issue. `Address Sanitizer` is a development tool with significant performance overhead and, according to the maintainer, is not used in production systems. 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 7.1 HIGH from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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-416 | CWE-664 | CWE-416 CWE-416: Use After Free | CWE-664 CWE-664: Improper Control of a Resource Through its Lifetime

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary7.1HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED7.1HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

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

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/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/9e0386c6d259f0c7499d52499d9891bee8a4... [email protected] github.com
github.com/asterisk/asterisk/commit/27b9544b32f059a4f614169243eaa7559f62... [email protected] github.com
github.com/asterisk/asterisk/releases/tag/22.10.1 [email protected] github.com
github.com/asterisk/asterisk/releases/tag/20.20.1 [email protected] github.com
github.com/asterisk/asterisk/commit/0f076168e0be31ebee37762192d0ee049e9c... [email protected] github.com
github.com/asterisk/asterisk/commit/f1e47621472bb3d8ad71f32823f5ca986e00... [email protected] github.com
github.com/asterisk/asterisk/commit/6e1f4df744369d66ea6f412e355d819b2a7b... [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/commit/b7ba85458796ef54b471017287c7806095db... [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/d4e30005940f86942745bcc64f34748d6987... [email protected] github.com
github.com/asterisk/asterisk/tree/24.0.0-pre1 [email protected] github.com
github.com/asterisk/asterisk/security/advisories/GHSA-g8q2-p36q-94f6 [email protected] github.com
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