OpenJDK 21 is a technology platform tracked by ThreatCluster, appearing in 3 threat clusters built from 2 intelligence report mentions.
OpenJDK 21 is a technology platform tracked across 3 threat clusters and 2 intelligence report mentions on ThreatCluster. First observed November 24, 2025; most recent activity February 3, 2026.
Vulnerabilities have been identified in OpenJDK versions 8, 11, and 21, as well as CRaC JDK 21. The RMI component in these versions allows unauthenticated remote attackers to establish TCP endpoint connections without…
Several critical security vulnerabilities were identified in various versions of OpenJDK, affecting Ubuntu 25.10 and its derivatives. The issues include improper handling of encoded strings and XML External Entity (XEE)…
OpenJDK versions 21 and 25 have been found to contain vulnerabilities that allow unauthenticated remote attackers to potentially modify files or leak sensitive information. The issues were discovered in the Security…
OpenJDK 21 is a technology platform tracked by ThreatCluster, appearing in 3 threat clusters built from 2 intelligence report mentions.
The most recent intelligence report mentioning OpenJDK 21 on ThreatCluster is dated February 3, 2026. Activity was first observed November 24, 2025, giving a tracked span from then to February 3, 2026.
Across ThreatCluster reporting, OpenJDK 21 most frequently co-occurs with Data Breach, Ubuntu, CVE-2025-53057, CVE-2025-53066, CVE-2025-61748, among 12 tracked related entities.
The most significant recent cluster is “Multiple OpenJDK Versions Exposed to Remote Information Theft Vulnerabilities” (16 articles · Updated February 2, 2026). OpenJDK 21 appears across 3 threat clusters in total, listed above with sources.
OpenJDK 21 appears in 2 intelligence report mentions across 3 deduplicated threat clusters, aggregated from 17,000+ monitored sources.