How severe is CVE-2021-39234?

CVE-2021-39234 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-39234 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39234?

CVE-2021-39234 affects Apache Ozone. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39234?

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

When was CVE-2021-39234 published?

CVE-2021-39234 was published on 2021-11-19 and last updated on 2026-06-17.

CVE-2021-39234

CVE-2021-39234 is a medium-severity vulnerability in Apache Ozone with a CVSS 3.x base score of 6.8. 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-863.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 4.9
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-863
Affected product: Apache Ozone
Published: 2021-11-19
Last modified: 2026-06-17

Description

In Apache Ozone versions prior to 1.2.0, Authenticated users knowing the ID of an existing block can craft specific request allowing access those blocks, bypassing other security checks like ACL.

Frequently asked questions

What is CVE-2021-39234?: In Apache Ozone versions prior to 1.2.0, Authenticated users knowing the ID of an existing block can craft specific request allowing access those blocks, bypassing other security checks like ACL.
How severe is CVE-2021-39234?: CVE-2021-39234 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-39234 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39234?: CVE-2021-39234 affects Apache Ozone. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39234?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39234 published?: CVE-2021-39234 was published on 2021-11-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:ozone:*:*:*:*:*:*:*:*

More vulnerabilities in Apache Ozone

CVE-2021-36372 — Critical (CVSS 9.8): In Apache Ozone versions prior to 1.2.0, Initially generated block tokens are persisted to the metadata database and…
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CVE-2021-39231 — Critical (CVSS 9.1): In Apache Ozone versions prior to 1.2.0, Various internal server-to-server RPC endpoints are available for connections,…
CVE-2021-39236 — High (CVSS 8.8): In Apache Ozone before 1.2.0, Authenticated users with valid Ozone S3 credentials can create specific OM requests,…
CVE-2021-39232 — High (CVSS 8.8): In Apache Ozone versions prior to 1.2.0, certain admin related SCM commands can be executed by any authenticated users,…
CVE-2024-45106 — High (CVSS 8.1): Improper authentication of an HTTP endpoint in the S3 Gateway of Apache Ozone 1.4.0 allows any authenticated Kerberos…

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Other CWE-863 (Incorrect Authorization) vulnerabilities

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CVE-2026-46595 — Critical (CVSS 10.0): Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of…
CVE-2026-33105 — Critical (CVSS 10.0): Improper authorization in Microsoft Azure Kubernetes Service allows an unauthorized attacker to elevate privileges over…
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