Red Hat Security Advisory: OpenJDK 21.0.6 Security Update for Windows Builds
Affects Red Hat OpenJDK 21.0.6Source GCVE Database
Not known to be exploited · fixed in Red Hat package updates : update Red Hat OpenJDK 21.0.6 when convenient.
Data as of 3 Nov 2026, 02:32 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- Patch
- Available – fixed in 21.0.6
Exploitation evidence
Disclosed: evidence found.
CVE published 22 Jan 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.
What to do
AI-suggested
A security update is available in Red Hat build of OpenJDK 21 version 21.0.6 for Windows, which addresses CVE-2025-21502. Users should upgrade from version 21.0.5 to 21.0.6 after applying all previously released relevant errata. Refer to Red Hat's official update instructions for proper application of this update.
Description
A security update for the Red Hat build of OpenJDK 21 (version 21.0.6) for Windows addresses a moderate severity vulnerability identified as CVE-2025-21502. The update enhances array handling in the Java Development Kit (JDK) to fix this issue. This release replaces the previous version 21.0.5 and includes security and bug fixes.
References
- access.redhat.com/errata/RHSA-2025:0428 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- docs.redhat.com/en/documentation/red_hat_build_of_openjdk/21/html/release_notes_for_red_hat_build_of_openjdk_21.0.6/index (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_0428.json (opens in a new tab)