CVE-2024-45807Network attack vector

Unauthenticated proxy crash via oghttp2 stream-state error

Published Sep 19, 2024 · Updated Sep 20, 2024

Denial of service in Envoy 1.31.0 through 1.31.1 allows remote attackers to crash the proxy by sending HTTP/2 traffic. The default Oghttp2 codec reaches OnBeginHeadersForStream with faulty stream-management state; the vendor has not disclosed the exact invalid transition. No authentication or user interaction is required, and successful exploitation interrupts traffic handled by the terminated proxy process.

CVSS severity7.5
High
EPSS probability0.50%
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 1.31.0 through 1.31.1 allows remote attackers to crash the proxy by sending HTTP/2 traffic. The default Oghttp2 codec reaches OnBeginHeadersForStream with faulty stream-management state; the vendor has not disclosed the exact invalid transition. No authentication or user interaction is required, and successful exploitation interrupts traffic handled by the terminated proxy process.

The record

CVE
CVE-2024-45807
Published
Sep 19, 2024
Updated
Sep 20, 2024
Vendor
Envoy Proxy
Product
Envoy
Classifications
CWE-670, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 20, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 1.31.0, < 1.31.2
  2. Affected versionversion=1.31.0 <1.31.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Envoy Proxy · Envoyversion=>= 1.31.0, < 1.31.2; version=1.31.0 <1.31.2

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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-670Always-Incorrect Control Flow Implementation
T1499Endpoint Denial of Service

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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