How severe is CVE-2026-21975?

CVE-2026-21975 has a CVSS 3.x base score of 4.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-21975 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21975?

CVE-2026-21975 affects Oracle Java Virtual Machine. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21975?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21975 have an EU (EUVD) identifier?

Yes. CVE-2026-21975 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3537.

When was CVE-2026-21975 published?

CVE-2026-21975 was published on 2026-01-20 and last updated on 2026-06-17.

CVE-2026-21975

CVE-2026-21975 is a medium-severity vulnerability in Oracle Java Virtual Machine with a CVSS 3.x base score of 4.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-404.

Key facts

Severity: Medium (CVSS 3.x base score 4.5)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3537
Weakness: CWE-404
Affected product: Oracle Java Virtual Machine
Published: 2026-01-20
Last modified: 2026-06-17

Description

Vulnerability in the Java VM component of Oracle Database Server. Supported versions that are affected are 19.3-19.29 and 21.3-21.20. Easily exploitable vulnerability allows high privileged attacker having Authenticated User privilege with network access via Oracle Net to compromise Java VM. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Java VM. CVSS 3.1 Base Score 4.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H).

Frequently asked questions

What is CVE-2026-21975?: Vulnerability in the Java VM component of Oracle Database Server. Supported versions that are affected are 19.3-19.29 and 21.3-21.20. Easily exploitable vulnerability allows high privileged attacker having Authenticated User privilege with network access via Oracle Net to compromise Java VM. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Java VM. CVSS 3.1 Base Score 4.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H).
How severe is CVE-2026-21975?: CVE-2026-21975 has a CVSS 3.x base score of 4.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-21975 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21975?: CVE-2026-21975 affects Oracle Java Virtual Machine. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21975?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21975 have an EU (EUVD) identifier?: Yes. CVE-2026-21975 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3537.
When was CVE-2026-21975 published?: CVE-2026-21975 was published on 2026-01-20 and last updated on 2026-06-17.

References

https://www.oracle.com/security-alerts/cpujan2026.html

Affected products (1)

cpe:2.3:a:oracle:java_virtual_machine:*:*:*:*:*:*:*:*

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