Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 53.6%; technical severity is CVSS 9.8.
Improper Access Control in Citrix ShareFile storage zones controller before 5.11.20 may allow an unauthenticated attacker to remotely compromise the storage zones controller.
Who should care
- Teams operating ShareFile, Sharefile Storagezones Controller
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether ShareFile, Sharefile Storagezones Controller is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Citrix Security advisory CTX328123
- 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.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-284
- Affected versions
- Citrix ShareFile; Citrix Sharefile Storagezones Controller (End Excluding 5.11.20)
- Fixed versions
- Citrix Sharefile Storagezones Controller (Fixed from 5.11.20)
- Published
- 23 September 2021
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 53.6%
- Signal calculated at 82