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CVE-2025-57767

Asterisk can crash from a specifically malformed Authorization header in an incoming SIP request

Published: Aug 28, 2025Updated: Oct 20, 2025 Sources: CVE List NVDCWE-253
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 70.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-253

Affected Products

asteriskasterisk
On-premWeb App
Communications / voip-telephony
asterisksangoma
On-prem
Communications
asteriskoss-projectCommunicationsaka open source, asterisk appliance developer kit
sangomacommercialCACommunicationsaka freepbx, certified asterisk, asterisk

Exploitability

Official Patch Available

References

https://github.com/asterisk/asterisk/security/advisories/GHSA-64qc-9x89-rx5j
github.com
https://github.com/asterisk/asterisk/pull/1407
github.com
https://github.com/asterisk/asterisk/commit/02993717b08f899d4aca9888062f35dfb198584f
github.com

Timeline

Published
Aug 28, 2025
Last Updated
Oct 20, 2025

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