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CVE-2024-27309

Apache Kafka: Potential incorrect access control during migration from ZK mode to KRaft mode

HIGH
7.4
CVSS Score
Published: April 12, 2024 at 06:58 AM UTC
Updated: June 17, 2026 at 07:19 AM UTC
1 product affected across 1 vendorKafka

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Severity
HIGH7.4
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

While an Apache Kafka cluster is being migrated from ZooKeeper mode to KRaft mode, in some cases ACLs will not be correctly enforced. Two preconditions are needed to trigger the bug: 1. The administrator decides to remove an ACL 2. The resource associated with the removed ACL continues to have two or more other ACLs associated with it after the removal. When those two preconditions are met, Kafka will treat the resource as if it had only one ACL associated with it after the removal, rather than the two or more that would be correct. The incorrect condition is cleared by removing all brokers in ZK mode, or by adding a new ACL to the affected resource. Once the migration is completed, there is no metadata loss (the ACLs all remain). The full impact depends on the ACLs in use. If only ALLOW ACLs were configured during the migration, the impact would be limited to availability impact. if DENY ACLs were configured, the impact could include confidentiality and integrity impact depending on the ACLs configured, as the DENY ACLs might be ignored due to this vulnerability during the migration period.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Kafka· Apachemaven
95%
3.5.0 ≤ v ≤ 3.5.23.5.0 ≤ v ≤ 3.6.13.6.0 ≤ v ≤ 3.6.13.5.03.6.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Mailing ListThird Party Advisory
Source: [email protected]
http://www.openwall.com/lists/oss-security/2024/04/12/3
Vendor AdvisoryMailing List
Source: [email protected]
https://lists.apache.org/thread/6536rmzyg076lzzdw2xdktvnz163mjpy
Third Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20240705-0002/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-863

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