{"id":"BIT-envoy-2021-43824","summary":"Null pointer dereference in envoy","details":"Envoy is an open source edge and service proxy, designed for cloud-native applications. In affected versions a crafted request crashes Envoy when a CONNECT request is sent to JWT filter configured with regex match. This provides a denial of service attack vector. The only workaround is to not use regex in the JWT filter. Users are advised to upgrade.","aliases":["CVE-2021-43824","GHSA-vj5m-rch8-5r2p"],"modified":"2026-09-08T08:47:08.257805791Z","published":"2024-03-06T10:56:58.513Z","database_specific":{"cpes":["cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"],"severity":"High"},"references":[{"type":"ADVISORY","url":"https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253a"},{"type":"ADVISORY","url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43824"}],"affected":[{"package":{"name":"envoy","ecosystem":"Bitnami","purl":"pkg:bitnami/envoy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.18.6"},{"introduced":"1.19.0"},{"fixed":"1.19.3"},{"introduced":"1.20.0"},{"fixed":"1.20.2"},{"introduced":"1.21.0"},{"fixed":"1.21.1"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/envoy/BIT-envoy-2021-43824.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.9.0"}