What is CVE-2026-57201?

CVE-2026-57201 is a high-severity vulnerability in Asterisk, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-10-27.

How severe is CVE-2026-57201?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Asterisk

CVE-2026-57201

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 stack buffer overflow in the H.323 `ooTrace()` trace-logging function can occur when unbounded `vsprintf` writes into a fixed `2048-byte buffer`. A remote attacker may send a carefully crafted packet that causes the Asterisk process to crash. The `chan_ooh323` addon channel driver must be explicitly compiled and installed, which is not the default, and its port must be publicly reachable. 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.

Vulnerability class: Buffer Overflow

Published 2026-10-27.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Asterisk — versions < 20.20.1, >= 21.0.0-pre1, < 21.12.3, >= 22.0.0-pre1, < 22.10.1
Asterisk Certified-Asterisk — versions < 20.7-cert11, >= 22.8-cert1-pre1, < 22.8-cert3

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

Frequently asked questions

What is CVE-2026-57201?: CVE-2026-57201 is a high-severity vulnerability in Asterisk, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-10-27.
How severe is CVE-2026-57201?: High severity. CVSS v3 base score is 7.5 out of 10.