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Vulnerability record · CVE-2023-37457 · published 14 December 2023

CVE-2023-37457: Digium asterisk classic buffer overflow vulnerability

Digium · Asterisk

Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.

8.2 CVSS 3.1 High EPSS 1.1% · top 35.3% CWE-120 · Classic buffer overflow
8.2CVSS 3.1 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/asterisk/asterisk/commit/a1ca0268254374b515fa5992f01340f7717113fa Patch
https://github.com/asterisk/asterisk/security/advisories/GHSA-98rc-4j27-74hh Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html
https://github.com/asterisk/asterisk/commit/a1ca0268254374b515fa5992f01340f7717113fa Patch
https://github.com/asterisk/asterisk/security/advisories/GHSA-98rc-4j27-74hh Vendor Advisory
https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-37457), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.