Exploited CVEs / Citrix / CVE-2021-22941
CVE-2021-22941
Citrix ShareFile Improper Access Control Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2022-04-15 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Citrix Security Bulletins, linked below.
Actively exploited Citrix ShareFile vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2022-03-25.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2021-22941
The storage zones controller in Citrix ShareFile can be compromised remotely by an unauthenticated attacker through this improper access control flaw. That controller brokers access to corporate file storage, so exploitation, confirmed in ransomware campaigns, exposes exactly the data organizations use ShareFile to protect. Severity is Critical at CVSS 9.8.
Do this: Update every ShareFile storage zones controller and review its logs for unauthenticated access prior to patching.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2021-22941
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2021-22941
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2022-04-15 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2021-22941
The authoritative fix and affected-version list are published by the vendor. Find the ShareFile advisory on Citrix Security Bulletins.
Common questions about CVE-2021-22941
Is CVE-2021-22941 actively exploited?
Yes. CVE-2021-22941 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2022-03-25, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 54%. CISA also reports it is known to be used in ransomware campaigns.
What is the CISA deadline and required action for CVE-2021-22941?
CISA set the federal (BOD 22-01) remediation due date at 2022-04-15, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2021-22941?
The authoritative fix is in the vendor advisory: see Citrix Security Bulletins for the patched ShareFile versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2021-22941?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2021-22941's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
