CVE-2024-51504Network attack vector

Unauthenticated command access via spoofed client IP

Published Nov 7, 2024 · Updated Nov 7, 2024

Authentication bypass in Apache ZooKeeper before 3.9.3 allows remote attackers to execute protected Admin Server commands. IPAuthenticationProvider accepts the client-controlled X-Forwarded-For header as the request's source IP instead of deriving it from a trusted proxy or socket. Exposure requires IP-based Admin Server authentication; successful spoofing permits arbitrary snapshot and restore commands, with information disclosure or service interruption.

CVSS severity9.1
Critical
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Apache ZooKeeper before 3.9.3 allows remote attackers to execute protected Admin Server commands. IPAuthenticationProvider accepts the client-controlled X-Forwarded-For header as the request's source IP instead of deriving it from a trusted proxy or socket. Exposure requires IP-based Admin Server authentication; successful spoofing permits arbitrary snapshot and restore commands, with information disclosure or service interruption.

The record

CVE
CVE-2024-51504
Published
Nov 7, 2024
Updated
Nov 7, 2024
Vendor
The Apache Software Foundation
Product
Apache ZooKeeper
Classifications
CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2024Record 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=3.9.0 <3.9.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache ZooKeeperversion=3.9.0 <3.9.3

Published CVSS scores

9.1UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-290Authentication Bypass by Spoofing
T1190Exploit Public-Facing Application

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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