CVE-2026-57187— Asterisk: Heap-use-after-free in Asterisk PJSIP TCP/SDP handling when TCP connection closes during SDP processing

Quick assessment

Affected

asterisk asterisk

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Asterisk 是一个开源的专用小交换机（PBX）和电话工具包。在 Asterisk 20.20.1、21.12.3、22.10.1、23.4.1 以及认证版 Asterisk 20.7-cert11、22.8-cert3 之前的版本中，经过身份验证的攻击者可以通过在面向连接的传输层上发送请求，并在 Asterisk 返回响应之前断开连接，从而在处理过程中触发堆内存释放后使用（heap-use-after-free）漏洞。目前，该崩溃仅在 Asterisk 使用地址检测器（Address Sanitizer

CVSS 7.1 · High Updated Oct 27, 2026

Possible ATT&CK Techniques 2 AI

T1068.001 T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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, 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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

释放后使用

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
asterisk	asterisk	< 20.20.1	-
asterisk	certified-asterisk	< 20.7-cert11	-

II. Public POCs for CVE-2026-57187

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-57187

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Other References for CVE-2026-57187 (15)

https://github.com/asterisk/asterisk/tree/24.0.0-pre1 x_refsource_MISC
https://github.com/asterisk/asterisk/releases/tag/23.4.1 x_refsource_MISC
https://github.com/asterisk/asterisk/releases/tag/21.12.3 x_refsource_MISC
https://github.com/asterisk/asterisk/releases/tag/20.20.1 x_refsource_MISC
https://github.com/asterisk/asterisk/releases/tag/22.10.1 x_refsource_MISC
https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3 x_refsource_MISC
https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11 x_refsource_MISC
https://github.com/asterisk/asterisk/security/advisories/GHSA-g8q2-p36q-94f6 x_refsource_CONFIRM
https://github.com/asterisk/asterisk/commit/0f076168e0be31ebee37762192d0ee049e9c0d42 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/27b9544b32f059a4f614169243eaa7559f622aa0 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/b7ba85458796ef54b471017287c7806095dbda76 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/6e1f4df744369d66ea6f412e355d819b2a7bf26c x_refsource_MISC
https://github.com/asterisk/asterisk/commit/f1e47621472bb3d8ad71f32823f5ca986e008437 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/9e0386c6d259f0c7499d52499d9891bee8a494fa x_refsource_MISC
https://github.com/asterisk/asterisk/commit/d4e30005940f86942745bcc64f34748d69870247 x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-57187

Same Patch Batch · asterisk · 2026-10-26 · 4 CVEs total

CVE-2026-57193	6.9 MEDIUM	Asterisk: LDAP Filter Injection in res_config_ldap via SIP Username (Unauthenticated Infor
CVE-2026-57184	6.3 MEDIUM	Asterisk: Out-of-Bounds Read in Q.931 Information Element Parser (H.323 Addon)
CVE-2026-57196	2.3 LOW	Asterisk: Reflected XSS in Phone Provisioning HTTP Error Pages

IV. Related Vulnerabilities

Same product: asterisk

Same vendor: asterisk

Same weakness: CWE-416