title: Excessive CPU usage when URI template matcher is configured using regex in Envoy
description: Envoy is a high-performance edge/middle/service proxy. The regex expression is compiled for every request and can result in high CPU usage and increased request latency when multiple routes are configured with such matchers. This issue has been addressed in released 1.29.1, 1.28.1, 1.27.3, and 1.26.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.
problem types: CWE-400: Uncontrolled Resource Consumption
affected:
{
vendor: envoyproxy
product: envoy
versions:
version: >= 1.29.0, < 1.29.1, status: affected
version: >= 1.28.0, < 1.28.1, status: affected
version: >= 1.27.0, < 1.27.3, status: affected
version: < 1.26.7, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 4.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
version: 3.1
]