CVE-2025-57767
HIGHDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 34% of all known CVEs.
References
Related Vulnerabilities
Other CWE-253 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-49286 | High | 8.6 | 10% | - | Fix |
| CVE-2017-7474 | Critical | 9.8 | 2.5% | - | - |
| CVE-2024-43521 | High | 7.5 | 2.4% | - | Fix |
| CVE-2020-6107 | Medium | 5.5 | 1.5% | - | Fix |
| CVE-2022-24880 | Medium | 5.3 | 1.2% | - | Fix |
| CVE-2023-24487 | Medium | 6.3 | 1.1% | - | Fix |
Common questions
How do I fix CVE-2025-57767?
Upgrade asterisk on debian unstable to 1:22.5.2~dfsg+~cs6.15.60671435-1 or later.
Is CVE-2025-57767 being actively exploited?
Not that we know of. CVE-2025-57767 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.41% is the estimated probability that it will be exploited in the next 30 days. That is higher than 34% of all scored CVEs.
How severe is CVE-2025-57767?
CVE-2025-57767 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2025-57767 affect?
Published advisories record a fix for asterisk (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2025-57767
Markdown
[](https://tridentstack.com/cve/CVE-2025-57767)HTML
<a href="https://tridentstack.com/cve/CVE-2025-57767"><img src="https://tridentstack.com/cve/badge/CVE-2025-57767.svg" alt="CVE-2025-57767"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-10-20.