# CVE-2025-57767

## Summary

- **CVE ID:** CVE-2025-57767
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-253
- **Published:** Aug 28, 2025
- **Last Modified:** Mar 13, 2026

## 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.

## Affected Products

- asterisk — asterisk (< 22.5.2)
- asterisk — asterisk (< 21.10.2)
- asterisk — asterisk (< 20.15.2)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.41%
- **EPSS Percentile:** 34.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._