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CVE-2026-57192— Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch

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 是一款开源的专用交换机（PBX）和电话系统工具包。在以下版本之前：Asterisk 20.20.1、21.12.3、22.10.1、23.4.1，以及认证版 Asterisk 20.7-cert11 和 22.8-cert3，经过身份验证的攻击者可能利用解码器中的越界写入漏洞（由样本计数不匹配引起），触发堆缓冲区溢出。该漏洞的利用需要满足以下条件：必须加载模块，且受攻击的终端设备必须已配置。攻击者需通过用户名/密码或源 IP 地址匹配的方式通过 SIP 身份验证，使用建立通话，并发送精心

CVSS 6.0 · Medium Updated Oct 28, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Asterisk: Out-of-Bounds Write in Codec2 Decoder Due to Floor/Ceil Sample Count Mismatch

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 buffer overflow through an out-of-bounds write in the `Codec2` decoder caused by a `floor/ceil sample-count mismatch`. The `codec_codec2` module must be loaded and `Codec2` must be configured on the attacked endpoint. The attacker must pass SIP authentication by username/password or `source IP address matching`, establish a call using `Codec2`, and send carefully crafted `Codec2` audio packets. 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:H/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存读

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-2026-57192

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-57192

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Vendor Pages for CVE-2026-57192 (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-2026-57192 (8)

https://github.com/asterisk/asterisk/security/advisories/GHSA-qf8j-jp7h-c5hx x_refsource_CONFIRM
https://github.com/asterisk/asterisk/commit/02e2d8d51efe1f811f2929224339cb1a35ffc079 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/aa40bc599a8e628859ef1c4fc944261423ceac0d x_refsource_MISC
https://github.com/asterisk/asterisk/commit/a0bc717b2261f4df7cdecc22b58a5fffbd1aa398 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/9b085d48fb66e90a0740ea59e26840421fd07acb x_refsource_MISC
https://github.com/asterisk/asterisk/commit/a2f1cc611f7d0f21faa03e8535009df3041c434c x_refsource_MISC
https://github.com/asterisk/asterisk/commit/4f5cad0611c67638a0a61cfedbe645045da8dd56 x_refsource_MISC
https://github.com/asterisk/asterisk/commit/d4ccfd55ffd7cf6d73a6e5cde347a7464c301006 x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-57192

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-2026-57194	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
CVE-2026-57199	2.3 LOW	Asterisk: Asterisk app_sms.c copies externally controlled SMS lengths into fixed in-struct

IV. Related Vulnerabilities

Same product: asterisk

Same vendor: asterisk

Same weakness: CWE-125