CVE-2024-53270: Envoyproxy Envoy

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Envoy is a cloud-native high-performance edge/middle/service proxy. In affected versions `sendOverloadError` is going to assume the active request exists when `envoy.load_shed_points.http1_server_abort_dispatch` is configured. If `active_request` is nullptr, only onMessageBeginImpl() is called. However, the `onMessageBeginImpl` will directly return ok status if the stream is already reset leading to the nullptr reference. The downstream reset can actually happen during the H/2 upstream reset. As a result envoy may crash. This issue has been addressed in releases 1.32.3, 1.31.5, 1.30.9, and 1.29.12. Users are advised to upgrade. Users unable to upgrade may disable `http1_server_abort_dispatch` load shed point and/or use a high threshold.

Affected products

• Envoyproxy Envoy: before 1.29.12 (fixed in 1.29.12); from 1.30.0, before 1.30.9 (fixed in 1.30.9); from 1.31.0, before 1.31.5 (fixed in 1.31.5); from 1.32.0, before 1.32.3 (fixed in 1.32.3)

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