CVE-2024-27309Network attack vector

ACL bypass via incomplete post-removal rewrite

Published Apr 12, 2024 · Updated Jul 30, 2025

Improper authorization in Apache Kafka 3.5.0 through 3.5.2 and 3.6.0 through 3.6.1 allows remote attackers to bypass ACLs. KRaftMigrationZkWriter.handleAclsDelta stops tracking a changed resource after its first surviving ACL match, so it writes only that ACL to ZooKeeper. The flaw requires an administrator to remove an ACL during migration; ignored DENY rules expose or alter data, while ALLOW-only setups can interrupt service.

CVSS severity7.4
High
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Apache Kafka 3.5.0 through 3.5.2 and 3.6.0 through 3.6.1 allows remote attackers to bypass ACLs. KRaftMigrationZkWriter.handleAclsDelta stops tracking a changed resource after its first surviving ACL match, so it writes only that ACL to ZooKeeper. The flaw requires an administrator to remove an ACL during migration; ignored DENY rules expose or alter data, while ALLOW-only setups can interrupt service.

The record

CVE
CVE-2024-27309
Published
Apr 12, 2024
Updated
Jul 30, 2025
Vendor
The Apache Software Foundation
Product
Apache Kafka
Classifications
CWE-863
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 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=3.5.0 <=3.5.2
  2. Affected versionversion=3.6.0 <=3.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Kafkaversion=3.5.0 <=3.5.2; version=3.6.0 <=3.6.1

Published CVSS scores

7.6GitHub Security AdvisoryCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
6.8GitHub Security AdvisoryCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
7.4CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

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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-863Incorrect Authorization

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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