CVE-2024-23322: Envoy crashes when idle and request per try timeout occur within the backoff interval

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-09 · updated 2026-06-17
Weakness: CWE-416

Description

Envoy is a high-performance edge/middle/service proxy. Envoy will crash when certain timeouts happen within the same interval. The crash occurs when the following are true: 1. hedge_on_per_try_timeout is enabled, 2. per_try_idle_timeout is enabled (it can only be done in configuration), 3. per-try-timeout is enabled, either through headers or configuration and its value is equal, or within the backoff interval of the per_try_idle_timeout. 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.

Affected products

envoyproxy envoy: from 1.26.0 before 1.26.7; from 1.27.0 before 1.27.3; from 1.28.0 before 1.28.1; from 1.29.0 before 1.29.1 — fixed in 1.26.7, 1.27.3, 1.28.1, 1.29.1

How to fix

Upgrade to a fixed version: envoyproxy envoy 1.26.7, 1.27.3, 1.28.1, 1.29.1. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-23322 or the next vulnerability affects your stack