Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 8.0%; technical severity is CVSS 9.8.
Citrix Workspace App before 1904 for Windows has Incorrect Access Control.
Who should care
- Teams operating Receiver, Workspace, Workspace Application and Receiver for Windows
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Receiver, Workspace, Workspace Application and Receiver for Windows is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Citrix Security advisory CTX251986
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Advisory
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-284
- Affected versions
- Citrix Receiver (Version 4.9); Citrix Workspace (End Excluding 1904); Citrix Workspace Application and Receiver for Windows
- Fixed versions
- Citrix Workspace (Fixed from 1904)
- Published
- 22 May 2019
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 8.0%
- Signal calculated at 74