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CVE-2026-57199— Asterisk: Asterisk app_sms.c copies externally controlled SMS lengths into fixed in-struct buffers

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 是一款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，文件会将外部可控的短信（SMS）长度复制到固定大小的结构体缓冲区中，且未进行充分的边界检查。这使得攻击者能够破坏内存或导致 Asterisk 崩溃。该漏洞的触发前提是管理员明确在拨号计划中使用了应用（该应用在将呼叫路由至或来自模拟设备时非常有用），并且未确保传递给该应用的数据

CVSS 2.3 · Low Updated Oct 28, 2026

Possible ATT&CK Techniques 2 AI

T1068.002 T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Asterisk: Asterisk app_sms.c copies externally controlled SMS lengths into fixed in-struct buffers

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, `app_sms.c` copies externally controlled `SMS` lengths into `fixed in-struct buffers` without sufficient bounds checks, allowing an attacker to corrupt memory or crash Asterisk. The administrator must explicitly use the `SMS` dialplan application, which is useful when routing calls to or from `analog devices`, and must not have ensured that data passed to the application is valid. 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:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存写

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-2026-57199

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-57199

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Vendor Pages for CVE-2026-57199 (7)

🔗 GitHub - asterisk/asterisk at 24.0.0-pre1 · GitHub x_refsource_MISC
🔗 Release Asterisk Release 23.4.1 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release 21.12.3 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release 20.20.1 · asterisk/asterisk · GitHub Read full article x_refsource_MISC
🔗 Release Asterisk Release 22.10.1 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release certified-22.8-cert3 · asterisk/asterisk · GitHub x_refsource_MISC
🔗 Release Asterisk Release certified-20.7-cert11 · asterisk/asterisk · GitHub x_refsource_MISC

Other References for CVE-2026-57199 (8)

https://github.com/asterisk/asterisk/security/advisories/GHSA-q9fr-m7g8-6ph5 x_refsource_CONFIRM
https://github.com/asterisk/asterisk/commit/f46f63bd4d33665d336cf8b5998650b915222549 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/661d6a2fc5cc7744ab9d849ed3c73ae5066386df x_refsource_MISC
https://github.com/asterisk/asterisk/commit/15c66022dc441ec63d7bd5f53cf7f35db72964be x_refsource_MISC
https://github.com/asterisk/asterisk/commit/60f4ef3deac6b9af30519b46c13f103264038b82 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/59b74276f24ba104d859f3f05897c9b8d835a28a x_refsource_MISC
https://github.com/asterisk/asterisk/commit/38a2059eb77a91a6b6e76eeba5875c2b96027368 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/7048a3841df99e090b9d87246600373581629c98 x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-57199

Same Patch Batch · asterisk · 2026-10-27 · 16 CVEs total

CVE-2026-57191	8.2 HIGH	Asterisk: Stack buffer overflow in MWI NOTIFY Message-Account parsing
CVE-2026-57202	8.1 HIGH	Asterisk: ARI setChannelVar bypasses live_dangerously and permits FILE() writes
CVE-2026-57197	7.7 HIGH	Asterisk: Heap Buffer Overflow in OGG/Speex File Playback (format_ogg_speex)
CVE-2026-57201	7.5 HIGH	Asterisk: Stack Buffer Overflow in H.323 ooTrace() via Unbounded vsprintf into Fixed 2048-
CVE-2026-57195	7.5 HIGH	Asterisk: NULL Pointer Dereference in HTTP AMI Digest Authentication
CVE-2026-57200	7.5 HIGH	Asterisk: ARI REST-over-WebSocket read-only bypass allows arbitrary module path load and c
CVE-2026-57186	7.5 HIGH	Asterisk: CVE-2022-37325 fix is absent from current chan_ooh323 Q.931 party-number parser
CVE-2026-57188	7.1 HIGH	Asterisk: Stack buffer overflow in res_xmpp XMPP namespace prefix handling
CVE-2026-57190	7.0 HIGH	Asterisk: SQL Injection in cel_pgsql and cel_tds via CELGenUserEvent eventtype Field
CVE-2026-57203	6.9 MEDIUM	Asterisk: Local privilege escalation through ast_loggrabber's world-writable helper locati
CVE-2026-57185	6.5 MEDIUM	Asterisk: Buffer over-read in Asterisk PJSIP MWI body parser
CVE-2026-57192	6.0 MEDIUM	Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch
CVE-2026-57194	5.9 MEDIUM	Asterisk: chan_unistim DIALPAGE digit handling can overflow phone_number and crash Asteris
CVE-2026-57198	2.3 LOW	Asterisk: Possible RED T.140 Heap Buffer Overflow
CVE-2026-57189	2.3 LOW	Asterisk: Possible RED T.140 Generation Accumulation OOB Write

IV. Related Vulnerabilities

Same product: asterisk

Same vendor: asterisk

Same weakness: CWE-787