Headline
CVE-2021-43824: Build software better, together
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.
Package
No package listed
Affected versions
V1.21.0 and earlier
Patched versions
1.18.6, 1.19.3, 1.20.2, 1.21.1
Description
CVSS Score 6.5 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, Medium
A crafted request crashes Envoy configured with JWT filter safe_regex match
Impact
Denial of Service (crash)
Patches
Has the problem been patched? What versions should users upgrade to?
Workarounds
Not use safe_regex for JWT filter
References
https://blog.envoyproxy.io
https://github.com/envoyproxy/envoy/releases
For more information
Open an issue in Envoy repo
Email us at envoy-security