CVE-2026-57195

HIGH 7.5

Asterisk: NULL Pointer Dereference in HTTP AMI Digest Authentication

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Asterisk is an open source private branch exchange and telephony toolkit. Prior to Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3, a NULL pointer dereference in the `Asterisk Manager Interface (AMI)` may allow an unauthenticated attacker to crash Asterisk when `Digest Authentication` is used via `HTTP`. The Asterisk `HTTP` web server, AMI, and AMI access via `HTTP` must all be enabled; each is disabled by default. The attacker must be able to connect to the `HTTP` server, which binds only to `127.0.0.1` by default even when enabled. This issue is fixed in Asterisk 20.20.1, 21.12.3, 22.10.1, 23.4.1 and Certified Asterisk 20.7-cert11, 22.8-cert3.

CWE	CWE-476
Vendor	asterisk
Product	asterisk
Published	Oct 27, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

asterisk / asterisk

< 20.20.1 >= 21.0.0-pre1, < 21.12.3 >= 22.0.0-pre1, < 22.10.1 >= 23.0.0-pre1, < 23.4.1

asterisk / certified-asterisk

< 20.7-cert11 >= 22.8-cert1-pre1, < 22.8-cert3

References

NVD ↗ CVE.org ↗ EPSS Data ↗