Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 99.9%; technical severity is CVSS 5.3.
Affected versions of Atlassian Confluence Server allow remote attackers to view restricted resources via a Pre-Authorization Arbitrary File Read vulnerability in the /s/ endpoint. The affected versions are before version 7.4.10, and from version 7.5.0 before 7.12.3.
Who should care
- Teams operating Confluence Data Center, Confluence Server
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Confluence Data Center, Confluence Server is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Atlassian Security advisory CONFSERVER 67893
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Advisory
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CWE
- CWE-425
- Affected versions
- Atlassian Confluence Data Center (End Excluding 7.4.10 | Start Including 7.5.0, End Excluding 7.12.3); Atlassian Confluence Server (End Excluding 7.4.10 | Start Including 7.5.0, End Excluding 7.12.3)
- Fixed versions
- Atlassian Confluence Data Center (Fixed from 7.4.10, 7.12.3); Atlassian Confluence Server (Fixed from 7.4.10, 7.12.3)
- Published
- 2 August 2021
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 99.9%
- Signal calculated at 83