Vulnerability in Envoyproxy Envoy

CVE-2025-30157

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (36.4th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-30157: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

  • Envoyproxy Envoy — versions < 1.30.10, >= 1.31.0, < 1.31.6, >= 1.32.0, < 1.32.4

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-30157?
CVE-2025-30157 is a medium-severity vulnerability in Envoyproxy Envoy, classified under CWE-460. CVSS score: 6.5/10. Published 2025-03-21.
How severe is CVE-2025-30157?
Medium severity. CVSS v3 base score is 6.5 out of 10.