CVE-2024-23323 Excessive CPU usage when URI template matcher is configured using regex in Envoy
Attackers can cause excessive CPU usage and service degradation in Envoy by exploiting regex-based URI template matchers, requiring an upgrade to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2024-23323?
CVE-2024-23323 is a medium-severity denial of service vulnerability in Envoyproxy Envoy, published on 9 Feb 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2024-23323?
1 open source package ship an affected version, including envoy. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
envoy Bitnami | From 1.26.0 | 1.26.7, 1.27.3, 1.28.1, 1.29.1 |
Products include Envoyproxy Envoy.
How do I fix CVE-2024-23323?
Upgrade envoy to a fixed version for your release line: 1.26.7, 1.27.3, 1.28.1 or 1.29.1.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-23323 being exploited?
There is no known exploitation of CVE-2024-23323 in the wild and no public exploit code.
Other vulnerabilities in Envoyproxy Envoy
Sources
Also known as BIT-envoy-2024-23323, GHSA-x278-4w4x-r7ch.