CVE-2024-32976 Envoy can enter an endless loop while decompressing Brotli data with extra input

What is CVE-2024-32976?

CVE-2024-32976 is a high-severity denial of service vulnerability in Envoyproxy Envoy, published on 4 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Envoy is a cloud-native, open source edge and service proxy. Envoyproxy with a Brotli filter can get into an endless loop during decompression of Brotli data with extra input.

Weakness: CWE-835

Which versions are affected by CVE-2024-32976?

1 open source package ship an affected version, including envoy. It affects 1 product.

Products include Envoyproxy Envoy.

How do I fix CVE-2024-32976?

Upgrade envoy to a fixed version for your release line: 1.27.6, 1.28.4, 1.29.5 or 1.30.2.

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-2024-32976 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-32976 exists.

Other vulnerabilities in Envoyproxy Envoy

• CVE-2022-29226 Trivial authentication bypass in Envoy Critical 10.0
• CVE-2019-18801 Memory corruption in n/a Critical 9.8
• CVE-2019-18802 Security feature bypass in n/a Critical 9.8
• CVE-2020-35470 Information disclosure in n/a High 8.8
• CVE-2024-23324 Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata High 8.6

All Envoyproxy Envoy vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-envoy-2024-32976, GHSA-7wp5-c2vq-4f8m.