What is CVE-2025-27818?

CVE-2025-27818 is a high-severity vulnerability in Apache Kafka, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2025-06-10.

How severe is CVE-2025-27818?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2025-27818 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Apache Kafka

CVE-2025-27818

A possible security vulnerability has been identified in Apache Kafka. This requires access to a alterConfig to the cluster resource, or Kafka Connect worker, and the ability to create/modify connectors on it with an arbitrary Kafka client…

Vulnerability class: Insecure Deserialization

EPSS: 0.009 (54.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apache Kafka
Apache Software Foundation Kafka — versions 2.3.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

security@apache.org (Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2025-27818?: CVE-2025-27818 is a high-severity vulnerability in Apache Kafka, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2025-06-10.
How severe is CVE-2025-27818?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2025-27818 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.