CVE-2024-34362: Envoy affected by a crash (use-after-free) in EnvoyQuicServerStream

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-06-04 · updated 2026-06-17
Weakness: CWE-416

Description

Envoy is a cloud-native, open source edge and service proxy. There is a use-after-free in `HttpConnectionManager` (HCM) with `EnvoyQuicServerStream` that can crash Envoy. An attacker can exploit this vulnerability by sending a request without `FIN`, then a `RESET_STREAM` frame, and then after receiving the response, closing the connection.

Affected products

envoyproxy envoy: before 1.27.6; from 1.28.0 before 1.28.4; from 1.29.0 before 1.29.5; from 1.30.0 before 1.30.2 — fixed in 1.27.6, 1.28.4, 1.29.5, 1.30.2

How to fix

Upgrade to a fixed version: envoyproxy envoy 1.27.6, 1.28.4, 1.29.5, 1.30.2. Check the vendor advisory for mitigations.

References

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