Security readout for executives and security teams
Plain-English summary
In affected Garoon versions, a logged-in user may see Bulletin titles they should not be allowed to view. The sources do not show full Bulletin content disclosure or unauthenticated access. Business impact depends on whether titles reveal confidential projects, HR matters, incidents, or customer information.
Executive priority
Treat as a targeted confidentiality issue, not an emergency remote-code-execution event. Prioritize remediation where Garoon Bulletins contain sensitive titles or where many internal or external users have authenticated access.
Technical view
CVE-2021-20772 is an information disclosure issue in the Bulletin feature of Cybozu Garoon 4.10.0 through 5.5.0. A remote authenticated attacker can obtain a Bulletin title without the required viewing privilege. The source bundle provides no CVSS score, CWE, root-cause detail, or confirmed fixed version.
Likely exposure
Exposure is limited to organizations running Cybozu Garoon versions 4.10.0 to 5.5.0 with authenticated users who can access the Garoon environment. Risk is higher where Bulletin titles contain sensitive operational, customer, HR, legal, or incident information.
Exploitation context
The bundle states remote authenticated access is required. CISA KEV status is false, and the provided sources do not claim active exploitation, public exploit availability, or exploitation in the wild.
Researcher notes
Evidence is sparse. The confirmed behavior is unauthorized disclosure of Bulletin titles by authenticated attackers. Do not assume disclosure of body content, unauthenticated impact, privilege escalation, or exploit availability without additional vendor evidence.
Mitigation direction
- Inventory Cybozu Garoon deployments and identify versions 4.10.0 through 5.5.0.
- Check Cybozu and JVN guidance for the vendor-confirmed fix or workaround.
- Plan upgrade or remediation according to the vendor advisory once confirmed.
- Avoid sensitive information in Bulletin titles until remediation is complete.
- Review account access and remove unnecessary authenticated users.
Validation and detection
- Confirm whether any Garoon instance runs an affected version.
- Identify whether the Bulletin feature is used for sensitive internal topics.
- Review Bulletin title naming practices for confidential information exposure.
- Check application logs for unusual authenticated Bulletin access patterns.
- Verify vendor-recommended remediation was applied after change completion.
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-2021-20772 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.