CVE-2024-53271: Envoyproxy Envoy

High severity, CVSS 7.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Envoy is a cloud-native high-performance edge/middle/service proxy. In affected versions envoy does not properly handle http 1.1 non-101 1xx responses. This can lead to downstream failures in networked devices. This issue has been addressed in versions 1.31.5 and 1.32.3. Users are advised to upgrade. There are no known workarounds for this issue.

Affected products

• Envoyproxy Envoy: from 1.31.0, before 1.31.5 (fixed in 1.31.5); from 1.32.0, up to and including 1.32.3

Published 2024-12-18. Last modified 2026-06-17.