CVE-2025-30157
Envoy crashes when HTTP ext_proc processes local replies
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Envoy crashes when HTTP ext_proc processes local replies
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.
- Record
CVE-2025-30157- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-460
- Updated
- 2026-11-02
EUVDEUVD-2025-7242
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.
- Record
EUVD-2025-7242- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-cf3q-gqg7-3fm9
Envoy crashes when HTTP ext_proc processes local replies
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 protocolbased 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
- Record
GHSA-cf3q-gqg7-3fm9- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-460
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2025-30157- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-460
- Updated
- 2026-11-02
OSV
Envoy crashes when HTTP ext_proc processes local replies
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.
- Record
CVE-2025-30157- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-460
- Updated
- 2026-11-02
OSVGHSA-cf3q-gqg7-3fm9
Envoy crashes when HTTP ext_proc processes local replies
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 protocolbased 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
- Record
GHSA-cf3q-gqg7-3fm9- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Weakness
- CWE-460
- Updated
- 2026-11-02
OSVBIT-envoy-2025-30157 No score
Envoy crashes when HTTP ext_proc processes local replies
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.
- Record
BIT-envoy-2025-30157- Updated
- 2026-11-02
OSVopenSUSE-SU-2025:14938-1 No score
istioctl-1.25.1-1.1 on GA media
These are all security issues fixed in the istioctl-1.25.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2025:14938-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/envoyproxy/envoyGo |
before 1.30.10 | 1.30.10 |
github.com/envoyproxy/envoyGo |
1.31.0 up to 1.31.6 | 1.31.6 |
github.com/envoyproxy/envoyGo |
1.32.0 up to 1.32.4 | 1.32.4 |
github.com/envoyproxy/envoyGo |
1.33.0 up to 1.33.1 | 1.33.1 |
envoyBitnami |
before 1.30.10, 1.31.0 up to 1.31.6, 1.32.0 up to 1.32.4, 1.33.0 up to 1.33.1 | 1.30.101.31.61.32.41.33.1 |
istioctlopenSUSE:Tumbleweed |
before 1.25.1-1.1 | 1.25.1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-30157 is a medium vulnerability (CVSS 6.5) in Envoyproxy Envoy, published March 21, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.44%, the 38th percentile. Fixed in github.com/envoyproxy/envoy 1.30.10.
References
github.com/envoyproxy/envoy/security/advisories/GHSA-cf3q-gqg7-3fm9
nvd.nist.gov/vuln/detail/CVE-2025-30157
lists.opensuse.org/archives/list/[email protected]/thread/GR5REVW6OBLYJVUSSX7MCRA6GRBMLN72
suse.com/security/cve/CVE-2025-30157