{"cve":"CVE-2023-37457","nvd":{"published":"2023-12-14T20:15:52.260","modified":"2026-06-17T06:08:15.497","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","score":8.2},"cwes":["CWE-120"],"references":["https://github.com/asterisk/asterisk/commit/a1ca0268254374b515fa5992f01340f7717113fa","https://github.com/asterisk/asterisk/security/advisories/GHSA-98rc-4j27-74hh","https://lists.debian.org/debian-lts-announce/2023/12/msg00019.html","https://github.com/asterisk/asterisk/commit/a1ca0268254374b515fa5992f01340f7717113fa","https://github.com/asterisk/asterisk/security/advisories/GHSA-98rc-4j27-74hh"],"products":["digium:asterisk","sangoma:certified_asterisk"],"source":"nvd","synced_at":"2026-10-19T21:42:34.585441961+00:00"},"epss":{"cve":"CVE-2023-37457","score":0.01116,"percentile":0.66075,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}