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CVE-2019-11634

KEVRansomware UseCitrix Workspace Application and Receiver for Windows Remote Code Execution Vulnerability
Description

Citrix Workspace Application and Receiver for Windows contains remote code execution vulnerability resulting from local drive access preferences not being enforced into the clients' local drives.

Citrix Workspace App before 1904 for Windows has Incorrect Access Control.

CVSS 3.1 vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
PublishedMay 22, 2019
Last modifiedAug 12, 2026
Added to KEVNov 3, 2021
Remediation dueMay 3, 2022
References
0 recent articles mention this CVE
    90
    Risk assessment · Critical

    Actively exploited and used by ransomware crews. Patch immediately.

    Exploitation
    Confirmed in the wild (CISA KEV)
    Federal remediation deadline
    Overdue by 1637 days
    Ransomware
    Used in known ransomware campaigns
    CVSS
    9.8 CRITICAL
    EPSS (30-day exploit probability)
    8.1% · top 5% of all CVEs
    Weakness
    NVD-CWE-noinfo
    Attack vector
    Network, remotely reachable
    Preconditions
    No privileges and no user interaction
    Recommended actions
    1. 1.Apply updates per vendor instructions.
    2. 2.Treat as emergency change: patch or isolate internet-facing instances first.
    3. 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
    4. 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
    5. 5.Verify offline/immutable backups and segment the affected systems. This flaw is used for ransomware initial access.

    Assessment is derived automatically from the live signals above; verify against your own asset inventory.