How severe is CVE-2021-28167?

CVE-2021-28167 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2021-28167 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28167?

CVE-2021-28167 affects Eclipse Openj9. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28167?

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

When was CVE-2021-28167 published?

CVE-2021-28167 was published on 2021-04-21 and last updated on 2026-06-17.

CVE-2021-28167

CVE-2021-28167 is a medium-severity vulnerability in Eclipse Openj9 with a CVSS 3.x base score of 6.5. 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-909.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.4
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-909
Affected product: Eclipse Openj9
Published: 2021-04-21
Last modified: 2026-06-17

Description

In Eclipse Openj9 to version 0.25.0, usage of the jdk.internal.reflect.ConstantPool API causes the JVM in some cases to pre-resolve certain constant pool entries. This allows a user to call static methods or access static members without running the class initialization method, and may allow a user to observe uninitialized values.

Frequently asked questions

What is CVE-2021-28167?: In Eclipse Openj9 to version 0.25.0, usage of the jdk.internal.reflect.ConstantPool API causes the JVM in some cases to pre-resolve certain constant pool entries. This allows a user to call static methods or access static members without running the class initialization method, and may allow a user to observe uninitialized values.
How severe is CVE-2021-28167?: CVE-2021-28167 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2021-28167 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28167?: CVE-2021-28167 affects Eclipse Openj9. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28167?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-28167 published?: CVE-2021-28167 was published on 2021-04-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:eclipse:openj9:*:*:*:*:*:*:*:*

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