CVE-2019-11634 Citrix Workspace Application and Receiver for Windows: command or code injection
In plain words: The program treats text it receives as instructions instead of plain data. The attacker can run commands on the machine — often the whole device is taken over.
Confirmed exploited by CISA on · US federal patch deadline May 3, 2022
What to do
- Install Citrix's security update for Workspace Application and Receiver for Windows. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Patch edge devices first — attackers often start scanning for them within hours of a fix.
- Never expose the device's admin page to the internet.
- After patching a device that was exposed, follow the vendor's compromise checks, end active sessions and change passwords.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: They face the internet and guard the whole network, so a flaw here can hand attackers a way in — and these devices usually run no antivirus, so break-ins go unnoticed.
The details
- Official name
- Citrix Workspace Application and Receiver for Windows Remote Code Execution Vulnerability
- Product
- Citrix Workspace Application and Receiver for Windows
- CISA 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.
- Type of flaw
- Command or code injection
- Confirmed exploited
- Nov 3, 2021 — known to be used in ransomware attacks
- US federal patch deadline
- May 3, 2022
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Answering about CVE-2019-11634 ·
Questions about CVE-2019-11634
Is CVE-2019-11634 being exploited?
Yes. CISA added CVE-2019-11634 to its Known Exploited Vulnerabilities catalog on Nov 3, 2021, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2019-11634?
Install Citrix's security update for Workspace Application and Receiver for Windows. If no update exists, follow the vendor's workaround or stop using the product until one ships. Patch edge devices first — attackers often start scanning for them within hours of a fix.
Am I affected by CVE-2019-11634?
Only if you use Citrix Workspace Application and Receiver for Windows. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.