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CVE-2025-21587VulnerabilityPublished Updated

Red Hat Security Advisory: OpenJDK 21.0.7 Security Update for Windows Builds

Affects Red Hat OpenJDK 21.0.7Source GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2025-21587· High 7.4

Not known to be exploited · CVSS 7.4 High.

Data as of 3 Nov 2026, 10:57 UTC

CVSS 3.1 base score
7.4High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.8% chance of exploitation in 30 days – higher than 57% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Apr 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 3 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Mavencom.oracle.java/java-sepkg:maven/com.oracle.java/java-seOther threatsAffected
  • 11.0.26 – 24
4 affected builds
Fixed in–
Mavencom.oracle.graalvm/graalvm-jdkpkg:maven/com.oracle.graalvm/graalvm-jdkOther threatsAffected
  • =17.0.14
  • =21.0.6
  • =24
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat recommends applying the OpenJDK 21.0.7 update for Windows, which replaces version 21.0.6 and includes the security fixes. Before applying this update, ensure all previously released errata relevant to your system have been applied. Detailed update instructions are available from Red Hat's official documentation. No additional mitigation steps are indicated beyond applying this update.

Description

Red Hat has released an update for its OpenJDK 21 build for Windows (version 21.0.7) that addresses multiple security issues. The update replaces version 21.0.6 and includes fixes for vulnerabilities related to TLS connection support, compiler transformations, and Buffered Image handling. These issues are tracked under CVE-2025-21587, CVE-2025-30691, and CVE-2025-30698. The update is rated as having a moderate security impact.

References

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