Security readout for executives and security teams
Plain-English summary
CVE-2021-39109 is a path traversal flaw in Atlassian Atlasboard before 1.1.9. A remote unauthenticated attacker could read arbitrary files from an affected server, creating confidentiality risk for secrets, configuration, and local data.
Executive priority
Prioritize remediation for any exposed Atlasboard deployment because the vulnerability can disclose server files without authentication. Internal-only systems still matter if they store credentials or configuration secrets.
Technical view
The vulnerable renderWidgetResource resource in Atlasboard allows path traversal leading to arbitrary file read. CVSS 3.1 is 7.5: network exploitable, low complexity, no privileges, no user interaction, high confidentiality impact, no integrity or availability impact listed.
Likely exposure
Exposure is likely limited to organizations running Atlassian Atlasboard versions before 1.1.9, especially if the application is reachable over a network or internet-facing. The source bundle provides no CPEs or detailed deployment indicators.
Exploitation context
The CVE record describes remote unauthenticated file read, but the bundle does not cite active exploitation. CISA KEV status is false. Treat exploitation as plausible due to low complexity, but do not assume observed attacks without local evidence.
Researcher notes
Evidence is concise: CWE-22 in renderWidgetResource, affected Atlasboard before 1.1.9, and a linked Atlassian commit. The bundle does not provide exploit details, affected CPEs, operational mitigations, or proof of exploitation.
Mitigation direction
- Upgrade Atlasboard to version 1.1.9 or later.
- Restrict network access to Atlasboard until upgraded.
- Remove or disable unused Atlasboard deployments.
- Review Atlassian commit and vendor guidance before applying compensating controls.
- Reduce sensitive files accessible to the Atlasboard runtime account.
Validation and detection
- Inventory Atlasboard instances and confirm their versions.
- Check whether Atlasboard is reachable from untrusted networks.
- Verify the renderWidgetResource behavior after upgrading.
- Review application logs for suspicious resource path requests.
- Confirm runtime file permissions limit access to secrets.
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.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-39109 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://bitbucket.org/atlassian/atlasboard/commits/9c03df09f09399e2601010466e8ba3a28236eb9cCVE 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.