CVE-2021-22941
CriticalExploitedPublic exploitImproper Access Control in Citrix ShareFile storage zones controller before 5.11.20 may allow an unauthenticated attacker to remotely compromise the storage zones controller.
Published Sep 23, 2021 · Updated Nov 3, 2025
Key Facts
Patch immediately- CVE-2021-22941 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Sharefile Storagezones Controller (Citrix), Citrix ShareFile storage zones controller.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 7, 2022 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 54% probability of exploitation in the next 30 days.
- Fixed versions are available, including Sharefile Storagezones Controller 5.11.20.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
54%
Higher than 98.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Mar 25, 2022 | Apr 15, 2022 | Known |
| Industry KEV feed | Mar 7, 2022 | Apr 15, 2022 | Known |
| CIRCL KEV | Mar 25, 2022 | Apr 15, 2022 | Known |
| ENISA EUVD | Mar 25, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Sharefile Storagezones ControllerCitrix | See advisory | 5.11.20 |
| Citrix ShareFile storage zones controller | >= 5.11.20 | n/a |
Patched Releases
Sharefile Storagezones Controller
5.11.20
Timeline
Publicly disclosed
Sep 23, 2021
Added to Industry KEV feed
Mar 7, 2022
Added to CISA KEV
Mar 25, 2022
Added to CIRCL KEV
Mar 25, 2022
Added to ENISA EUVD
Mar 25, 2022
Last updated
Nov 3, 2025
Weakness Type
- CWE-284 Improper Access Control
References
- advisoryhttps://support.citrix.com/article/CTX328123
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Sharefile Storagezones Controller (Citrix); Citrix ShareFile storage zones controller versions >= 5.11.20. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 7, 2022 and is known to be used in ransomware campaigns.
Yes. It was added on Mar 25, 2022 with a federal remediation due date of Apr 15, 2022.
Public exploit code is available.
Fixed versions are available, including Sharefile Storagezones Controller 5.11.20.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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