CVE-2025-57767

HIGH EPSS 29.9%
Published Aug 28, 202510mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
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Published Aug 28, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
29.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-253

Affected Products 3

VendorProductVersionRange
sangomaasterisk* <20.15.2
sangomaasterisk*≥21.0.0  –  <21.10.2
sangomaasterisk*≥22.0.0  –  <22.5.2

References 3

  • github.com https://github.com/asterisk/asterisk/commit/02993717b08f899d4aca9888062f35dfb198584f
    Patch
  • github.com https://github.com/asterisk/asterisk/pull/1407
    Issue TrackingPatch
  • github.com https://github.com/asterisk/asterisk/security/advisories/GHSA-64qc-9x89-rx5j
    Vendor Advisory

Remediation

  • github.com https://github.com/asterisk/asterisk/commit/02993717b08f899d4aca9888062f35dfb198584f
    Patch
  • github.com https://github.com/asterisk/asterisk/pull/1407
    Issue TrackingPatch