OpenDJ LDAP DoS via Alias Loop Before 4.9.3 (alias deref always)
CVE-2025-27497 Published on March 5, 2025
OpenDJ Denial of Service (Dos) using alias loop
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.
Weakness Type
What is an Infinite Loop Vulnerability?
The program contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. If the loop can be influenced by an attacker, this weakness could allow attackers to consume excessive resources such as CPU or memory.
CVE-2025-27497 has been classified to as an Infinite Loop vulnerability or weakness.
Affected Versions
OpenIdentityPlatform OpenDJ Version < 4.9.3 is affected by CVE-2025-27497Vulnerable Packages
The following package name and versions may be associated with CVE-2025-27497
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| maven | org.openidentityplatform.opendj:opendj-server-legacy | < 4.9.3 | 4.9.3 |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.