CVE-2025-30157 Envoy crashes when HTTP ext_proc processes local replies

What is CVE-2025-30157?

CVE-2025-30157 is a medium-severity vulnerability in Envoyproxy Envoy, published on 21 Mar 2025. 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 cloud-native high-performance edge/middle/service proxy. Prior to 1.33.1, 1.32.4, 1.31.6, and 1.30.10, Envoy's ext_proc HTTP filter is at risk of crashing if a local reply is sent to the external server due to the filter's life time issue. A known situation is the failure of a websocket handshake will trigger a local reply leading to the crash of Envoy. This vulnerability is fixed in 1.33.1, 1.32.4, 1.31.6, and 1.30.10.

Weakness: CWE-460

Which versions are affected by CVE-2025-30157?

9 open source packages ship an affected version, including github.com/envoyproxy/envoy and envoy. It affects 1 product.

Products include Envoyproxy Envoy.

How do I fix CVE-2025-30157?

Upgrade github.com/envoyproxy/envoy to a fixed version for your release line: 1.30.10, 1.31.6, 1.32.4 or 1.33.1.

Is CVE-2025-30157 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-30157 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-2025-30157, GHSA-cf3q-gqg7-3fm9, openSUSE-SU-2025:14938-1.