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CVE-2021-22941

89
FAUCET Score

CVE-2021-22941 is a critical improper access control vulnerability affecting Citrix ShareFile storage zones controllers prior to version 5.11.20. This flaw allows an unauthenticated attacker to remotely compromise the controller, leading to complete loss of confidentiality, integrity, and availability. With a CVSS score of 9.8, it is easily exploitable over the network with low attack complexity. This vulnerability is actively exploited in the wild, including in known ransomware campaigns, and has garnered significant community discussion, despite a lack of public exploit code on platforms like Metasploit or ExploitDB.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.11.20CPE matchmatch criteria
cpe:2.3:a:citrix:sharefile_storagezones_controller:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
53.59%
Probability of exploitation in next 30 days
EPSS Percentile
98.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Mar 25, 2022
This CVE's current EPSS score of 0.5359 is in the 97th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

citrixvendor investigatingvia nvd_reference
View patch

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
support.citrix.com / article/CTX328123
Broken LinkVendor Advisory