CVE-2019-19781
CriticalExploitedPublic exploitThey allow Directory Traversal.
Published Dec 27, 2019 · Updated Aug 12, 2026 · Also known as Shitrix
Key Facts
Patch immediately- CVE-2019-19781 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Application Delivery Controller (Citrix), Gateway (Citrix), Netscaler Gateway (Citrix) and 3 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 16, 2020 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 100% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
100%
Higher than 99.9% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2019-19781 brief as a PDF
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Description
An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0. They allow Directory Traversal.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | May 3, 2022 | Known |
| Industry KEV feed | Jan 16, 2020 | May 3, 2022 | Known |
| CIRCL KEV | Nov 3, 2021 | May 3, 2022 | Known |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
13 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Application Delivery ControllerCitrix | See advisory | n/a |
| GatewayCitrix | See advisory | n/a |
| Netscaler GatewayCitrix | See advisory | n/a |
| Application Delivery Controller FirmwareCitrix | 10.5, 11.1, 12.0, 12.1, 13.0 | n/a |
| Gateway FirmwareCitrix | 13.0 | n/a |
Timeline
Publicly disclosed
Dec 27, 2019
Added to Industry KEV feed
Jan 16, 2020
Added to CISA KEV
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Last updated
Aug 12, 2026
Weakness Type
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
References
- advisoryhttp://packetstormsecurity.com/files/155904/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution.html
- advisoryhttp://packetstormsecurity.com/files/155905/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution-Traversal.html
- advisoryhttp://packetstormsecurity.com/files/155930/Citrix-Application-Delivery-Controller-Gateway-10.5-Remote-Code-Execution.html
- advisoryhttp://packetstormsecurity.com/files/155947/Citrix-ADC-NetScaler-Directory-Traversal-Remote-Code-Execution.html
- advisoryhttp://packetstormsecurity.com/files/155972/Citrix-ADC-Gateway-Path-Traversal.html
FAQ
Common Questions.
An issue was discovered in Citrix Application Delivery Controller (ADC) and Gateway 10.5, 11.1, 12.0, 12.1, and 13.0.
Affected: Application Delivery Controller (Citrix); Gateway (Citrix); Netscaler Gateway (Citrix), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 16, 2020 and is known to be used in ransomware campaigns.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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