High severity7.5NVD Advisory· Published Feb 22, 2022· Updated Jun 17, 2026
CVE-2021-43824
CVE-2021-43824
Description
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.
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Affected products
4cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*range: <1.18.6
- (no CPE)range: >= 1.20.0, < 1.20.2
Patches
Vulnerability mechanics
References
2- github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253anvdPatchThird Party Advisory
- github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2pnvdIssue TrackingThird Party Advisory
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