Asterisk can crash from a specifically malformed Authorization header in an incoming SIP request
Published Aug 28, 2025
7.5
HIGHCVSS 3.1
EPSS 0.41%
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
-
- Version < 20.15.2StatusaffectedConstraints-
- Version < 21.10.2StatusaffectedConstraints-
- Version < 22.5.2StatusaffectedConstraints-
- Version
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Aug 28, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.41% (0.00408) | 32.74th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.38% (0.00384) | 29.94th | v5 (v2026.06.15) |
| Aug 29, 2025 | 0.09% (0.00086) | 25.63th | v4 (v2025.03.14) |
References (3)
- https://github.com/asterisk/asterisk/commit/02993717b08f899d4aca9888062f35dfb198584f x_refsource_MISCPatch
- https://github.com/asterisk/asterisk/pull/1407 x_refsource_MISCIssue TrackingPatch
- https://github.com/asterisk/asterisk/security/advisories/GHSA-64qc-9x89-rx5j x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/asterisk/asterisk/commit/02993717b08f899d4aca9888062f35dfb198584f | x_refsource_MISCPatch | |
| https://github.com/asterisk/asterisk/pull/1407 | x_refsource_MISCIssue TrackingPatch | |
| https://github.com/asterisk/asterisk/security/advisories/GHSA-64qc-9x89-rx5j | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.