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CVE-2021-39127

MEDIUM
5.3
CVSS Score
Published: October 21, 2021 at 02:35 AM UTC
Updated: June 17, 2026 at 04:03 AM UTC
3 products affected across 1 vendorJira ServerJiraJira Data Center

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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Jira· Atlassianatlassian-app
95%
v < 8.5.10
Affected range stops below 8.5.10, so it looks safe — our inference, not a vendor statement
Jira Data Center· Atlassianatlassian-app
95%
v ≥ 8.6.0v < 8.13.1v < 8.5.108.6.0 ≤ v < 8.13.18.6.0
Affected range stops below 8.13.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.5.10, so it looks safe — our inference, not a vendor statement
Jira Server· Atlassianatlassian-app
95%
v ≥ 8.6.0v < 8.13.1v < 8.5.108.6.0 ≤ v < 8.13.18.6.0
Affected range stops below 8.13.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.5.10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCIssue TrackingPatchVendor Advisory
Source: [email protected]
https://jira.atlassian.com/browse/JRASERVER-72003

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-Other

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