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CVE-2023-37457— Asterisk's PJSIP_HEADER dialplan function can overwrite memory/cause crash when using 'update'

Quick assessment

Affected
asterisk asterisk
Exploitation
Public or AI PoC available; prioritize validation
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PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk存在安全漏洞，该漏洞源于 超出用于存储标头新值的可用缓冲区空间,可能会覆盖内存或导致崩溃。

CVSS 7.5 · High EPSS 1.12% · P65

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-37457

Vulnerability Information
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Vulnerability Title
Asterisk's PJSIP_HEADER dialplan function can overwrite memory/cause crash when using 'update'
Source: CVE Program / CVE List V5
Vulnerability Description
Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Asterisk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Asterisk是一款PBX系统的软件，运行在Linux系统上，支持使用SIP、IAX、H323协议进行IP通话。 Asterisk存在安全漏洞，该漏洞源于 超出用于存储标头新值的可用缓冲区空间,可能会覆盖内存或导致崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
asterisk asterisk <= 18.20.0 -

II. Public POCs for CVE-2023-37457

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8558 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2023-37457

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Patches & Fixes for CVE-2023-37457 (1)

Mailing List Discussions for CVE-2023-37457 (1)

Same Patch Batch · asterisk · 2023-12-14 · 3 CVEs total

CVE-2023-49786 7.5 HIGH Asterisk susceptible to Denial of Service via DTLS Hello packets during call initiation
CVE-2023-49294 4.9 MEDIUM Asterisk Path Traversal vulnerability

IV. Related Vulnerabilities

Same product: asterisk
Same vendor: asterisk
Same weakness: CWE-120

V. Comments for CVE-2023-37457

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