High severity · published Oct 27, 2026
CVE-2026-57195
Asterisk: NULL Pointer Dereference in HTTP AMI Digest Authentication
New
7.5
CVSS
–
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
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 · source: vendor
CE
certified-asterisk · asterisk
< 20.7-cert11; >= 22.8-cert1-pre1, < 22.8-cert3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57195
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57195
github.com
https://github.com/asterisk/asterisk/commit/10c5b2efcacab03bf04a229f81cc24e76fe42c41
github.com
https://github.com/asterisk/asterisk/commit/362ef847e7e057b7626e476ddcfe7328ea314db4
github.com
https://github.com/asterisk/asterisk/commit/5d5d8d8ef7f16774820b1889ae73d8d2ab14af45
github.com
https://github.com/asterisk/asterisk/commit/87a1f43e4c465b885163665aa89172ed0f392663
github.com
https://github.com/asterisk/asterisk/commit/a1fcfdf9b91ed58cc8fb9da8d135da60bae7345d
github.com
https://github.com/asterisk/asterisk/commit/abba42c58fee2226a709583afdbeec75cf1dde8b
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