CVE-2025-27497: OpenDJ Denial of Service (Dos) using alias loop
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.
Classification
CVE ID: CVE-2025-27497
CVSS Base Severity: HIGH
CVSS Base Score: 8.7
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected Products
Vendor: OpenIdentityPlatform
Product: OpenDJ
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 13.73% (scored less or equal to compared to others)
EPSS Date: 2025-04-02 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-27497https://github.com/OpenIdentityPlatform/OpenDJ/security/advisories/GHSA-93qr-h8pr-4593
https://github.com/OpenIdentityPlatform/OpenDJ/commit/08aee4724608e4a32baa3c7d7499ec913a275aaf