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Related Vulnerabilities: 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.

Source

Description

The MITRE CVE dictionary describes this issue as:

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.

Additional Information

  • Bugzilla 2050744: CVE-2021-43824 envoy: Null pointer dereference when using JWT filter safe_regex match
  • CWE-476: NULL Pointer Dereference
  • FAQ: Frequently asked questions about CVE-2021-43824

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