How severe is CVE-2021-39235?

CVE-2021-39235 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2021-39235 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39235?

CVE-2021-39235 affects Apache Ozone. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39235?

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

When was CVE-2021-39235 published?

CVE-2021-39235 was published on 2021-11-19 and last updated on 2026-06-17.

CVE-2021-39235

CVE-2021-39235 is a medium-severity vulnerability in Apache Ozone 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-732.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-732
Affected product: Apache Ozone
Published: 2021-11-19
Last modified: 2026-06-17

Description

In Apache Ozone before 1.2.0, Ozone Datanode doesn't check the access mode parameter of the block token. Authenticated users with valid READ block token can do any write operation on the same block.

Frequently asked questions

What is CVE-2021-39235?: In Apache Ozone before 1.2.0, Ozone Datanode doesn't check the access mode parameter of the block token. Authenticated users with valid READ block token can do any write operation on the same block.
How severe is CVE-2021-39235?: CVE-2021-39235 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-39235 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39235?: CVE-2021-39235 affects Apache Ozone. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39235?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39235 published?: CVE-2021-39235 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…
CVE-2021-39233 — Critical (CVSS 9.1): In Apache Ozone versions prior to 1.2.0, Container related Datanode requests of Ozone Datanode were not properly…
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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