How severe is CVE-2025-27819?

CVE-2025-27819 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-27819 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27819?

CVE-2025-27819 affects Apache Kafka. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27819?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-27819 have an EU (EUVD) identifier?

Yes. CVE-2025-27819 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-17641.

When was CVE-2025-27819 published?

CVE-2025-27819 was published on 2025-06-10 and last updated on 2026-06-17.

CVE-2025-27819

CVE-2025-27819 is a high-severity vulnerability in Apache Kafka with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-17641
Weakness: CWE-502
Affected product: Apache Kafka
Published: 2025-06-10
Last modified: 2026-06-17

Description

In CVE-2023-25194, we announced the RCE/Denial of service attack via SASL JAAS JndiLoginModule configuration in Kafka Connect API. But not only Kafka Connect API is vulnerable to this attack, the Apache Kafka brokers also have this vulnerability. To exploit this vulnerability, the attacker needs to be able to connect to the Kafka cluster and have the AlterConfigs permission on the cluster resource. Since Apache Kafka 3.4.0, we have added a system property ("-Dorg.apache.kafka.disallowed.login.modules") to disable the problematic login modules usage in SASL JAAS configuration. Also by default "com.sun.security.auth.module.JndiLoginModule" is disabled in Apache Kafka 3.4.0, and "com.sun.security.auth.module.JndiLoginModule,com.sun.security.auth.module.LdapLoginModule" is disabled by default in in Apache Kafka 3.9.1/4.0.0

Frequently asked questions

What is CVE-2025-27819?: In CVE-2023-25194, we announced the RCE/Denial of service attack via SASL JAAS JndiLoginModule configuration in Kafka Connect API. But not only Kafka Connect API is vulnerable to this attack, the Apache Kafka brokers also have this vulnerability. To exploit this vulnerability, the attacker needs to be able to connect to the Kafka cluster and have the AlterConfigs permission on the cluster resource. Since Apache Kafka 3.4.0, we have added a system property ("-Dorg.apache.kafka.disallowed.login.modules") to disable the problematic login modules usage in SASL JAAS configuration. Also by default "com.sun.security.auth.module.JndiLoginModule" is disabled in Apache Kafka 3.4.0, and "com.sun.security.auth.module.JndiLoginModule,com.sun.security.auth.module.LdapLoginModule" is disabled by default in in Apache Kafka 3.9.1/4.0.0
How severe is CVE-2025-27819?: CVE-2025-27819 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-27819 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27819?: CVE-2025-27819 affects Apache Kafka. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27819?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-27819 have an EU (EUVD) identifier?: Yes. CVE-2025-27819 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-17641.
When was CVE-2025-27819 published?: CVE-2025-27819 was published on 2025-06-10 and last updated on 2026-06-17.

References

https://kafka.apache.org/cve-list

Affected products (1)

cpe:2.3:a:apache:kafka:*:*:*:*:*:*:*:*

More vulnerabilities in Apache Kafka

CVE-2026-33557 — Critical (CVSS 9.1): A possible security vulnerability has been identified in Apache Kafka. By default, the broker property…
CVE-2025-27818 — High (CVSS 8.8): A possible security vulnerability has been identified in Apache Kafka. This requires access to a alterConfig to…
CVE-2018-17196 — High (CVSS 8.8): In Apache Kafka versions between 0.11.0.0 and 2.1.0, it is possible to manually craft a Produce request which bypasses…
CVE-2026-35554 — High (CVSS 8.7): A race condition in the Apache Kafka Java producer client’s buffer pool management can cause messages to be silently…
CVE-2025-27817 — High (CVSS 7.5): A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients…
CVE-2022-34917 — High (CVSS 7.5): A security vulnerability has been identified in Apache Kafka. It affects all releases since 2.8.0. The vulnerability…

All CVEs affecting Apache Kafka →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-69836 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Entra ID allows an unauthorized attacker to execute code over a network.
CVE-2026-17061 — Critical (CVSS 10.0): A Deserialization of Untrusted Data vulnerability affecting SIMULIA Execution Engine from Release 2023 through Release…
CVE-2026-11756 — Critical (CVSS 10.0): A Deserialization of Untrusted Data vulnerability affecting Station Launcher App in 3DEXPERIENCE platform from Release…
CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →