title: Envoy forwards invalid Http2/Http3 downstream headers
description: Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should reject malformed request lines. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, There is a possibility that non compliant HTTP/1 service may allow malformed requests, potentially leading to a bypass of security policies. This issue is fixed in versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9.
problem types: CWE-20: Improper Input Validation
affected:
{
vendor: envoyproxy
product: envoy
versions:
version: >= 1.25.0, < 1.25.3, status: affected
version: >= 1.24.0, < 1.24.4, status: affected
version: >= 1.23.0, < 1.23.6, status: affected
version: < 1.22.9, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.4
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
version: 3.1
]