In short
- CVE-2025-30157 is a HIGH (CVSS 7.5) vulnerability affecting github.com/envoyproxy/envoy, envoy (envoyproxy).
- Chance of exploitation in the next 30 days (EPSS): 0.44%, higher than 37.9% of all vulnerabilities.
- Fix: update to 1.31.6, 1.32.4, 1.33.1, 1.30.10 or later.
| Package | Affected versions | Patched versions |
|---|
| github.com/envoyproxy/envoy Go | ≥ 1.31.0, < 1.31.6≥ 1.32.0, < 1.32.4≥ 1.33.0, < 1.33.1< 1.30.10
| 1.31.61.32.41.33.11.30.10
|
| envoy | = 1.33.0≥ 1.31.0, < 1.31.6≥ 1.32.0, < 1.32.4< 1.30.10
| 1.31.61.32.41.30.10
|
Description
Summary
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 fail of a websocket handshake will trigger a local reply leading to the crash of Envoy.
PoC
If both websocket and ext_proc are enabled, a failed handshake will trigger a local reply, thus ext_proc will crash.
Mitigation
- Disable websocket traffic
- Change the websocket response from backend to always return
101 Switch protocol based on RFC.
- Apply the patch and the ext_proc filter will not send the local reply that is generated by Envoy to the ext_proc server for processing.
- Apply the patch that the router will cancel the upstream requests when sending a local reply.
Impact
Denial of service
Reporter
Vasilios Syrakis
Fernando Cainelli
NVD 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.
More vulnerabilities in github.com/envoyproxy/envoy
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