UpHeron
All vulnerabilities

Servers and applications

CVE-2021-43824

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.

Severity
High 7.5
Published
22 Feb 2022
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
1.18.6, 1.19.3, 1.20.2, 1.21.1
Sources
NVD

Affected software

SoftwareAffected versions
EnvoyServers and applications · cpe:a:envoyproxy:envoy
  • Every version before 1.18.6
  • From 1.19.0 before 1.19.3
  • From 1.20.0 before 1.20.2
  • From 1.21.0 before 1.21.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-43824
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-43824