CVE-2025-57767CWE-253

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

High · published August 28, 2025

CVSS v3.1
7.5
EPSS
0%
Percentile
33.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00408 · 33.7th percentile
Weakness
CWE-253 · Incorrect Check of Function Return Value
Published
2025-08-28T15:33Z
EPSS history
Timeline
  • 28 AUG 15:33Z
    Asterisk can crash from a specifically malformed Authorization header in an incoming SIP request
    cvelistv5