How severe is CVE-2021-39239?

CVE-2021-39239 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-39239 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39239?

CVE-2021-39239 affects Apache Jena. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39239?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-39239 published?

CVE-2021-39239 was published on 2021-09-16 and last updated on 2026-06-17.

CVE-2021-39239

CVE-2021-39239 is a high-severity vulnerability in Apache Jena with a CVSS 3.x base score of 7.5. 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-611.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-611
Affected product: Apache Jena
Published: 2021-09-16
Last modified: 2026-06-17

Description

A vulnerability in XML processing in Apache Jena, in versions up to 4.1.0, may allow an attacker to execute XML External Entities (XXE), including exposing the contents of local files to a remote server.

Frequently asked questions

What is CVE-2021-39239?: A vulnerability in XML processing in Apache Jena, in versions up to 4.1.0, may allow an attacker to execute XML External Entities (XXE), including exposing the contents of local files to a remote server.
How severe is CVE-2021-39239?: CVE-2021-39239 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-39239 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39239?: CVE-2021-39239 affects Apache Jena. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39239?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-39239 published?: CVE-2021-39239 was published on 2021-09-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:jena:*:*:*:*:*:*:*:*

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