CVE-2019-11634 kev+ ransomware in the critical feed json
Citrix Workspace App before 1904 for Windows has Incorrect Access Control.
published 2019-05-22 7 y ago modified 2026-08-12 2 mo ago also EUVD-2019-3304
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Exploited
- added 2021-11-03, used in ransomware
- epss
- 8.1%
- EPSS 8.1% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known
Summary
Citrix Workspace App before 1904 for Windows has Incorrect Access Control.
Patch / fix
cisa required action Apply updates per vendor instructions.
- citrix workspace 1904
Timeline
- Published
- CISA SSVC: exploitation active
- Added to CISA KEV
- CISA patch deadline
Known exploited
- Added
- 5 y ago
- Patch by
- 2022-05-03 (4 y ago)
- Ransomware
- Known to be used in ransomware campaigns
- Required action
- Apply updates per vendor instructions.
- Vendor, product
- Citrix, Workspace Application and Receiver for Windows
- CISA name
- Citrix Workspace Application and Receiver for Windows Remote Code Execution Vulnerability
Ransomware
Groups reported to have exploited it in intrusions.
- Nefilim ransomware gang
reported by news.sophos.com
Ransomware Vulnerability Matrix by BushidoUK (github.com/BushidoUK/Ransomware-Vulnerability-Matrix), reformatted per CVE. CC BY 4.0
ATT&CK techniques
How it is exploited and what it leads to, in MITRE ATT&CK terms.
- T1190 Exploit Public-Facing Application exploitation
- T1059 Command and Scripting Interpreter primary impact
- T1003 OS Credential Dumping secondary impact
- T1005 Data from Local System secondary impact
- T1046 Network Service Discovery secondary impact
- T1078 Valid Accounts secondary impact
- T1486 Data Encrypted for Impact secondary impact
kev release 2025-07-28, att&ck v16.1. KEV to ATT&CK mappings by the MITRE Center for Threat-Informed Defense (Mappings Explorer, Apache-2.0). © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. Terms of use
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- yes
- Technical impact
- total
- Assessed
- 5 y ago
Exploit prediction
8.09% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-284 Improper Access Control
- Technology feeds
References
-
support.citrix.com
/v1/search?searchQuery=%22%22&lang=en&sort=cr_date_desc&prod=&pver=&ct=Security+Bulletin
vendor-advisory
-
support.citrix.com
/article/CTX251986
vendor-advisory
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11634
government-resource, us-government-resource
Sources
- CVE List CVE-2019-11634
- NVD CVE-2019-11634
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.