Security readout for executives and security teams
Plain-English summary
This issue affects Atlassian Jira Server and Jira Data Center. An unauthenticated remote attacker could access the JQL query component endpoint through broken access control, with limited integrity impact. It is not listed as KEV in the provided bundle, and no active exploitation evidence is cited.
Executive priority
Schedule remediation in normal vulnerability management timelines, accelerated for internet-facing Jira. Business risk is moderate because authentication is not required, but the cited impact is limited to integrity and no active exploitation is evidenced.
Technical view
CVE-2021-39127 is a broken access control flaw in the Jira query component JQL endpoint. Affected ranges are before 8.5.10 and 8.6.0 through before 8.13.1. CVSS 3.1 is 5.3, network-accessible, low complexity, no privileges, no user interaction, integrity impact only.
Likely exposure
Organizations running Jira Server or Jira Data Center in the affected version ranges are potentially exposed, especially if Jira is reachable from the internet or untrusted networks. Atlassian Cloud is not identified in the provided sources.
Exploitation context
The source bundle supports unauthenticated remote reachability but does not cite public exploitation, KEV listing, exploit code, or observed attacks. Treat exploitation status as unconfirmed rather than active.
Researcher notes
The bundle provides limited technical detail and no CWE mapping. Focus validation on product edition, version range, exposure path, and anonymous access behavior. Avoid assuming broader Jira components or Atlassian Cloud are affected without vendor evidence.
Mitigation direction
- Upgrade Jira Server/Data Center outside affected ranges per Atlassian guidance.
- Prioritize internet-facing or broadly accessible Jira instances first.
- Restrict Jira access to trusted networks where operationally feasible.
- Review Atlassian JRASERVER-72003 for vendor-specific remediation details.
Validation and detection
- Inventory Jira Server and Data Center versions across all environments.
- Confirm whether any instance is before 8.5.10 or 8.6.0 before 8.13.1.
- Check whether affected instances are reachable by unauthenticated users.
- Review access logs for unusual anonymous JQL endpoint activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-39127 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://jira.atlassian.com/browse/JRASERVER-72003CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.