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CVE-2025-57767— Asterisk can crash from a specifically malformed Authorization header in an incoming SIP request

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Asterisk开源的一款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 20.15.2版本和22.5.2之前版本存在安全漏洞，该漏洞源于get_authorization_header函数返回NULL导致SEGV。

CVSS 7.5 · High EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-57767

Vulnerability Information
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Vulnerability Title
Asterisk can crash from a specifically malformed Authorization header in an incoming SIP request
Source: CVE Program / CVE List V5
Vulnerability Description
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.15.2, 21.10.2, and 22.5.2, if a SIP request is received with an Authorization header that contains a realm that wasn't in a previous 401 response's WWW-Authenticate header, or an Authorization header with an incorrect realm was received without a previous 401 response being sent, the get_authorization_header() function in res_pjsip_authenticator_digest will return a NULL. This wasn't being checked before attempting to get the digest algorithm from the header which causes a SEGV. This issue has been patched in versions 20.15.2, 21.10.2, and 22.5.2. There are no workarounds.
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
对函数返回值的检查不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Asterisk 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Asterisk是Asterisk开源的一款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 20.15.2版本和22.5.2之前版本存在安全漏洞，该漏洞源于get_authorization_header函数返回NULL导致SEGV。
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 < 22.5.2 -

II. Public POCs for CVE-2025-57767

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6632 chars
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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-2025-57767

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IV. Related Vulnerabilities

Same product: asterisk
Same vendor: asterisk
Same weakness: CWE-253

V. Comments for CVE-2025-57767

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