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CVE-2021-22891

29
FAUCET Score

CVE-2021-22891 is a critical missing authorization vulnerability affecting Citrix ShareFile Storage Zones Controller versions prior to 5.7.3, 5.8.3, 5.9.3, 5.10.1, and 5.11.18. With a CVSS score of 9.8, this flaw allows unauthenticated remote attackers to fully compromise the Storage Zones Controller with low attack complexity, leading to complete confidentiality, integrity, and availability impact. Despite its severity, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 5.7, < 5.7.3CPE matchmatch criteria
cpe:2.3:a:citrix:sharefile_storagezones_controller:*:*:*:*:*:*:*:*
>= 5.8, <= 5.8.3CPE matchmatch criteria
cpe:2.3:a:citrix:sharefile_storagezones_controller:*:*:*:*:*:*:*:*
>= 5.9, < 5.9.3CPE matchmatch criteria
cpe:2.3:a:citrix:sharefile_storagezones_controller:*:*:*:*:*:*:*:*
>= 5.10, < 5.10.1CPE matchmatch criteria
cpe:2.3:a:citrix:sharefile_storagezones_controller:*:*:*:*:*:*:*:*
>= 5.11, < 5.11.18CPE 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
1.08%
Probability of exploitation in next 30 days
EPSS Percentile
61.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0108 is in the 47th percentile among its peer group of 36,897 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

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

citrixpatch availablevia nvd_reference
View patch

References

support.citrix.com / article/CTX310780
PatchVendor Advisory