How severe is CVE-2021-39127?

CVE-2021-39127 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-39127 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39127?

CVE-2021-39127 primarily affects Atlassian Jira. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-39127?

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

When was CVE-2021-39127 published?

CVE-2021-39127 was published on 2021-10-21 and last updated on 2026-06-17.

CVE-2021-39127

CVE-2021-39127 is a medium-severity vulnerability in Atlassian Jira with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Atlassian Jira
Published: 2021-10-21
Last modified: 2026-06-17

Description

Affected versions of Atlassian Jira Server and Data Center allow anonymous remote attackers to the query component JQL endpoint via a Broken Access Control vulnerability (BAC) vulnerability. The affected versions are before version 8.5.10, and from version 8.6.0 before 8.13.1.

Frequently asked questions

What is CVE-2021-39127?: Affected versions of Atlassian Jira Server and Data Center allow anonymous remote attackers to the query component JQL endpoint via a Broken Access Control vulnerability (BAC) vulnerability. The affected versions are before version 8.5.10, and from version 8.6.0 before 8.13.1.
How severe is CVE-2021-39127?: CVE-2021-39127 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-39127 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39127?: CVE-2021-39127 primarily affects Atlassian Jira. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-39127?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-39127 published?: CVE-2021-39127 was published on 2021-10-21 and last updated on 2026-06-17.

References

https://jira.atlassian.com/browse/JRASERVER-72003

Affected products (4)

cpe:2.3:a:atlassian:jira:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_data_center:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_server:*:*:*:*:*:*:*:*
cpe:2.3:a:atlassian:jira_software_data_center:*:*:*:*:*:*:*:*

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