Threats / Citrix / CVE-2019-11634
CVE-2019-11634
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Citrix Workspace Application and Receiver for Windows vulnerability
Citrix Workspace Application and Receiver for Windows contains a remote code execution vulnerability due to insufficient enforcement of local drive access restrictions, allowing attackers to execute arbitrary code on affected systems.
Verdict
Today item, not a backlog item.
This vulnerability enables remote code execution through improper local drive access controls. Active exploitation and ransomware campaigns have been documented, making it a critical threat to Windows endpoints running affected Citrix client software.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
6 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.08091 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Citrix, Workspace Application and Receiver for Windows. Confirm exact fixed builds in the vendor advisory.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I exploit the local drive access bypass to write malicious code to the client system.
Business
Endpoints running Citrix clients become compromised entry points for ransomware and data theft operations.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute arbitrary code with the privileges of the Citrix application process.
Business
Attackers gain persistent access to corporate networks and can move laterally to critical systems.
3
Lateral reach — past segmentation narrative 3
Attacker
I deploy ransomware or exfiltration tools across compromised client machines.
Business
Organizations face operational disruption, data loss, and financial extortion from active ransomware campaigns.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05