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, an authenticated attacker may cause a stack buffer overflow in `res_xmpp` `XMPP namespace prefix` handling using carefully crafted packets. The `res_xmpp` module must be loaded, an XMPP connection must be configured in `xmpp.conf`, and the attacker must have an XMPP account on the same or a federated server. 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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00522.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
asterisk asterisk affected
Version Status Constraints
< 20.20.1 affected —
>= 21.0.0-pre1, < 21.12.3 affected —
>= 22.0.0-pre1, < 22.10.1 affected —
>= 23.0.0-pre1, < 23.4.1 affected —
asterisk certified-asterisk affected
Version Status Constraints
< 20.7-cert11 affected —
>= 22.8-cert1-pre1, < 22.8-cert3 affected —

No data.

No data.

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Vendors Products
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Asterisk Subscribe
Certified Asterisk Subscribe

Project Subscriptions

Vendors Products
Asterisk Subscribe
Asterisk Subscribe
Certified Asterisk Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/asterisk/asterisk/commit/12072a559f592736a44dd9fbe1594e84714edfb4 cve-icon cve-icon
https://github.com/asterisk/asterisk/commit/1328dbb503da4aa11a480a9c28e170f17e5f4e84 cve-icon cve-icon
https://github.com/asterisk/asterisk/commit/3c4b08cf94eeaa3faefb3ae6c2d6ce1bd9747a13 cve-icon cve-icon
https://github.com/asterisk/asterisk/commit/433102c16b8edfc31d28c96166fef03fe72fb923 cve-icon cve-icon
https://github.com/asterisk/asterisk/commit/5e626250628b2579530f3f17e7b0aa37d082873b cve-icon cve-icon
https://github.com/asterisk/asterisk/commit/d570a85e45153a36919ace5d0ab06a195b30f9d1 cve-icon cve-icon
https://github.com/asterisk/asterisk/commit/e329a6803ac5214028f98cc5f0b7167d66e32c08 cve-icon cve-icon
https://github.com/asterisk/asterisk/releases/tag/20.20.1 cve-icon cve-icon
https://github.com/asterisk/asterisk/releases/tag/21.12.3 cve-icon cve-icon
https://github.com/asterisk/asterisk/releases/tag/22.10.1 cve-icon cve-icon
https://github.com/asterisk/asterisk/releases/tag/23.4.1 cve-icon cve-icon
https://github.com/asterisk/asterisk/releases/tag/certified-20.7-cert11 cve-icon cve-icon
https://github.com/asterisk/asterisk/releases/tag/certified-22.8-cert3 cve-icon cve-icon
https://github.com/asterisk/asterisk/security/advisories/GHSA-mxgm-8c6f-5p8f cve-icon cve-icon
https://github.com/asterisk/asterisk/tree/24.0.0-pre1 cve-icon cve-icon
History

Tue, 27 Oct 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Asterisk
Asterisk asterisk
Asterisk certified Asterisk
Vendors & Products Asterisk
Asterisk asterisk
Asterisk certified Asterisk

Tue, 27 Oct 2026 18:15:00 +0000

Type Values Removed Values Added
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, an authenticated attacker may cause a stack buffer overflow in `res_xmpp` `XMPP namespace prefix` handling using carefully crafted packets. The `res_xmpp` module must be loaded, an XMPP connection must be configured in `xmpp.conf`, and the attacker must have an XMPP account on the same or a federated server. 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.
Title Asterisk: Stack buffer overflow in res_xmpp XMPP namespace prefix handling
Weaknesses CWE-787
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-27T17:55:29.170Z

Reserved: 2026-06-24T02:00:46.799Z

Link: CVE-2026-57188

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-27T18:17:37.367

Modified: 2026-10-28T14:22:07.513

Link: CVE-2026-57188

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-27T21:15:08Z

Weaknesses