CVE-2025-57767

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 v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-253 CWE-253

Affected Products

Vendor	Product	Versions
sangoma	asterisk	< 20.15.2
sangoma	asterisk	21.0.0 — 21.10.2
sangoma	asterisk	22.0.0 — 22.5.2

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2025-57767? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-57767? +

CVE-2025-57767 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-57767? +

CVE-2025-57767 affects products from sangoma, specifically: asterisk. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-57767? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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