Is CVE-2025-57767 actively exploited?

No active exploitation of CVE-2025-57767 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-57767 be exploited remotely?

Yes. CVE-2025-57767 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-57767?

CVE-2025-57767 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2025-57767

CWE-253Published: August 28, 2025· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2025-57767 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.