Security readout for executives and security teams
Plain-English summary
CVE-2021-20759 is a privilege-control flaw in Cybozu Garoon’s Bulletin feature. An authenticated remote user could alter Portal data without having the proper privilege. This is mainly an integrity and governance risk for organizations using affected Garoon versions.
Executive priority
Treat as a moderate priority if Garoon is used internally. The issue requires authentication, but it can undermine trusted portal content and business workflows.
Technical view
The published description identifies an operational restrictions bypass in Bulletin for Cybozu Garoon versions 4.6.0 through 5.0.2. The attacker must be remote and authenticated. The documented impact is unauthorized alteration of Portal data; the source bundle provides no CVSS, CWE, patch version, or exploit detail.
Likely exposure
Exposure is limited to Cybozu Garoon deployments running versions 4.6.0 to 5.0.2, especially where Bulletin is available to authenticated users.
Exploitation context
The source bundle does not show CISA KEV listing, public exploitation, or exploit availability. Evidence supports only authenticated remote misuse.
Researcher notes
Evidence is sparse. The record gives affected versions and impact but no CVSS vector, CWE, root cause, fixed version, or exploit status. Avoid assuming broader Garoon modules are affected.
Mitigation direction
- Inventory Cybozu Garoon deployments and confirm versions.
- Review Cybozu and JVN advisories for vendor remediation guidance.
- Restrict Garoon access to trusted authenticated users.
- Review Bulletin and Portal permissions for unnecessary access.
- Monitor Portal data changes for unexpected modifications.
Validation and detection
- Confirm no production Garoon instance runs versions 4.6.0 through 5.0.2.
- Verify Bulletin access is limited to intended user groups.
- Review Portal change history for unexplained edits.
- Check whether vendor guidance has been applied to each instance.
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-2021-20759 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://cs.cybozu.co.jp/2021/007206.htmlCVE reference · x_refsource_MISC
- https://jvn.jp/en/jp/JVN54794245/index.htmlCVE 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.