CVE-2025-30157Network attack vector

Service crash via externally processed local replies

Published Mar 21, 2025 · Updated Mar 21, 2025

Denial of service in Envoy before 1.30.10, 1.31.0 through 1.31.5, 1.32.0 through 1.32.3, and 1.33.0 allows remote attackers to crash the proxy. The ext_proc filter lacks local-reply completion handling, so Envoy forwards its own local reply for external processing after the stream lifecycle has changed. Both ext_proc and WebSocket handling must be enabled, and a failed WebSocket handshake supplies the documented trigger that terminates Envoy.

CVSS severity6.5
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Envoy before 1.30.10, 1.31.0 through 1.31.5, 1.32.0 through 1.32.3, and 1.33.0 allows remote attackers to crash the proxy. The ext_proc filter lacks local-reply completion handling, so Envoy forwards its own local reply for external processing after the stream lifecycle has changed. Both ext_proc and WebSocket handling must be enabled, and a failed WebSocket handshake supplies the documented trigger that terminates Envoy.

The record

CVE
CVE-2025-30157
Published
Mar 21, 2025
Updated
Mar 21, 2025
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-460, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.30.10
  2. Affected versionversion=>= 1.31.0, < 1.31.6
  3. Affected versionversion=>= 1.32.0, < 1.32.4
  4. Affected versionversion=>= 1.33.0, < 1.33.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Envoy Proxy · Envoyversion=< 1.30.10; version=>= 1.31.0, < 1.31.6; version=>= 1.32.0, < 1.32.4; version=>= 1.33.0, < 1.33.1

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-460Improper Cleanup on Thrown Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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