title: Null pointer dereference in envoy
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.
problem types: CWE-476: NULL Pointer Dereference
affected:
{
product: envoy
vendor: envoyproxy
versions:
status: affected, version: >= 1.20.0, < 1.20.2
status: affected, version: >= 1.19.0, < 1.19.3
status: affected, version: < 1.18.6
status: affected, version: >= 1.21.0, < 1.21.1
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]