CVE-2025-30157
Envoy crashes when HTTP ext_proc processes local replies
Impact
### 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 1. Disable websocket traffic 2. Change the websocket response from backend to always return `101 Switch protocol` based on RFC. 3. 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. 4. 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
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/envoyproxy/envoy | < 1.30.10 | 1.30.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Envoyproxy | Envoy | before 1.30.10 from 1.31.0 before 1.31.6 from 1.32.0 before 1.32.4 Version 1.33.0 |