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7.5 High

CVE-2021-43824 Envoy is an open source edge and service proxy, designed for cloud-native applications

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.

Affected products and versions

Product Affected versions Fixed in
envoy 1.21 1.21.0 → < 1.21.1 1.21.1
envoy 1.20 1.20.0 → < 1.20.2 1.20.2
envoy 1.19 1.19.0 → < 1.19.3 1.19.3
envoy 1.18 earliest → < 1.18.6 1.18.6

References

Timeline

  1. Published
  2. Last modified

Other CVEs of envoy

The 98 CVEs of envoy →
CVE-2026-73511 Envoy is an open source edge and service proxy designed for cloud-native applications 5.3 Medium CVE-2026-73553 Envoy is an open source edge and service proxy designed for cloud-native applications 7.5 High CVE-2026-73551 Envoy is an open source edge and service proxy designed for cloud-native applications 5.3 Medium CVE-2026-73546 Envoy is an open source edge and service proxy designed for cloud-native applications 7.4 High
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