CVE-2021-43824
HIGHEnvoy < 1.18.6 - Denial of Service via CONNECT Request to JWT Filter with Regex Match
Title source: llmDescription
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.
References (2)
Core 2
Core References
Issue Tracking, Third Party Advisory x_refsource_confirm
https://github.com/envoyproxy/envoy/security/advisories/GHSA-vj5m-rch8-5r2p
Patch, Third Party Advisory x_refsource_misc
https://github.com/envoyproxy/envoy/commit/9371333230b1a6e1be2eccf4868771e11af6253a
Scores
CVSS v3
7.5
EPSS
0.0105
EPSS Percentile
59.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-476
Status
published
Products (1)
envoyproxy/envoy
< 1.18.6
Published
Feb 22, 2022
Tracked Since
Feb 18, 2026