CVE-2025-27818Network attack vector

Authenticated code execution via LDAP response deserialization

Published Jun 10, 2025 · Updated Feb 26, 2026

Deserialization of untrusted data in Apache Kafka 2.3.0 through 3.9.0 allows remote authenticated users to execute code via crafted LDAP responses. The sasl.jaas.config connector-client overrides load LdapLoginModule, causing the server to contact an attacker-controlled LDAP service and deserialize its reply. Reachability requires AlterConfig access or permission to create or modify connectors with arbitrary SASL JAAS settings and a SASL protocol; code execution additionally requires a usable gadget chain on the classpath.

CVSS severity8.8
High
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Apache Kafka 2.3.0 through 3.9.0 allows remote authenticated users to execute code via crafted LDAP responses. The sasl.jaas.config connector-client overrides load LdapLoginModule, causing the server to contact an attacker-controlled LDAP service and deserialize its reply. Reachability requires AlterConfig access or permission to create or modify connectors with arbitrary SASL JAAS settings and a SASL protocol; code execution additionally requires a usable gadget chain on the classpath.

The record

CVE
CVE-2025-27818
Published
Jun 10, 2025
Updated
Feb 26, 2026
Vendor
The Apache Software Foundation
Product
Apache Kafka
Classifications
CWE-502, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record 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=2.3.0 <=3.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Kafkaversion=2.3.0 <=3.9.0

Published CVSS scores

8.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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