Exploited CVEs / Citrix / CVE-2019-11634
CVE-2019-11634
Citrix Workspace Application and Receiver for Windows Remote Code Execution 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 2022-05-03 (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 Workspace Application and Receiver for Windows vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2021-11-03.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2019-11634
Citrix Workspace App and Receiver for Windows fail to enforce local drive access preferences, allowing remote code execution against the client machines connecting to Citrix sessions rather than the servers. That inversion matters: every workstation with the client installed is the attack surface, and CISA records ransomware use of this Critical Severity flaw. Client-side agents like this update far less reliably than the server farm does.
Do this: Push updated Citrix Workspace clients through your software deployment tool and report on remaining machines with 2019-era Receiver installs.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2019-11634
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2019-11634
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: 2022-05-03 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2019-11634
The authoritative fix and affected-version list are published by the vendor. Find the Workspace Application and Receiver for Windows advisory on Citrix Security Bulletins.
Common questions about CVE-2019-11634
Is CVE-2019-11634 actively exploited?
Yes. CVE-2019-11634 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 8.0%. CISA also reports it is known to be used in ransomware campaigns.
What is the CISA deadline and required action for CVE-2019-11634?
CISA set the federal (BOD 22-01) remediation due date at 2022-05-03, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2019-11634?
The authoritative fix is in the vendor advisory: see Citrix Security Bulletins for the patched Workspace Application and Receiver for Windows 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-2019-11634?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2019-11634'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.
