CVE-2021-22941
Citrix ShareFile Improper Access Control Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 25 Mar 2022
- Used in ransomware campaigns
Description
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.
Key facts
- Published
- 23 Sep 2021
- Last changed
- 21 Oct 2025
- Assigned by
- hackerone
- KEV added
- 25 Mar 2022
- KEV fix due
- 15 Apr 2022
- Used in ransomware
- Yes, according to CISA
- EPSS
- 53.585% likely to be exploited in the next 30 days, higher than 99.01% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | Citrix ShareFile storage zones controller |
|
Timeline
- 23 Sep 2021 Published
- 25 Mar 2022 CVE-2021-22941 added to CISA KEV
- 25 Mar 2022 Added to the CISA KEV catalogue