VulnerabilityAnalyzed

CVE-2025-57767

Asterisk is an open source private branch exchange and telephony toolkit.

HIGH 7.5EPSS 0.41%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.41%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.41% probability · 34th percentile
CISA KEV: Not listed
Weakness: CWE-253
Affected: sangoma/asterisk
Source: security-advisories@github.com

References

https://github.com/asterisk/asterisk/commit/02993717b08f899d4aca9888062f35dfb198584fPatch
https://github.com/asterisk/asterisk/pull/1407Issue Tracking, Patch
https://github.com/asterisk/asterisk/security/advisories/GHSA-64qc-9x89-rx5jVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.