Red Hat Security Advisory: OpenJDK 21.0.6 Security Update for Portable Linux Builds
Affects Red Hat OpenJDK 21.0.6Source GCVE Database
Not known to be exploited.
Data as of 3 Nov 2026, 02:32 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
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
Red Hat has released OpenJDK 21.0.6 as an official fix for this vulnerability. Users should update to this version after applying all previously released errata relevant to their system. Detailed update instructions are available from Red Hat's documentation. No additional mitigation steps are indicated or necessary beyond applying this update.
Description
Red Hat has released an update for OpenJDK 21 (version 21.0.6) addressing a moderate security issue identified as CVE-2025-21502, which involves enhancements to array handling. This update replaces the previous version 21.0.5 and includes security and bug fixes as well as enhancements. No public exploit or detailed CVSS score is provided in the advisory.
References
- access.redhat.com/errata/RHSA-2025:0427 (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_0427.json (opens in a new tab)