How severe is CVE-2025-27497?

CVE-2025-27497 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2025-27497 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-27497?

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-2025-27497 have an EU (EUVD) identifier?

Yes. CVE-2025-27497 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6169.

When was CVE-2025-27497 published?

CVE-2025-27497 was published on 2025-03-05 and last updated on 2026-06-17.

CVE-2025-27497

CVE-2025-27497 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. 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-835.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-6169
Weakness: CWE-835
Published: 2025-03-05
Last modified: 2026-06-17

Description

OpenDJ is an LDAPv3 compliant directory service. OpenDJ prior to 4.9.3 contains a denial-of-service (DoS) vulnerability that causes the server to become unresponsive to all LDAP requests without crashing or restarting. This issue occurs when an alias loop exists in the LDAP database. If an ldapsearch request is executed with alias dereferencing set to "always" on this alias entry, the server stops responding to all future requests. Fortunately, the server can be restarted without data corruption. This vulnerability is fixed in 4.9.3.

Frequently asked questions

What is CVE-2025-27497?: OpenDJ is an LDAPv3 compliant directory service. OpenDJ prior to 4.9.3 contains a denial-of-service (DoS) vulnerability that causes the server to become unresponsive to all LDAP requests without crashing or restarting. This issue occurs when an alias loop exists in the LDAP database. If an ldapsearch request is executed with alias dereferencing set to "always" on this alias entry, the server stops responding to all future requests. Fortunately, the server can be restarted without data corruption. This vulnerability is fixed in 4.9.3.
How severe is CVE-2025-27497?: CVE-2025-27497 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2025-27497 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-27497?: 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-2025-27497 have an EU (EUVD) identifier?: Yes. CVE-2025-27497 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6169.
When was CVE-2025-27497 published?: CVE-2025-27497 was published on 2025-03-05 and last updated on 2026-06-17.

References

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