CVE-2019-19781

Name: CVE-2019-19781
Creator: NVD / NIST
Published: 2019-12-27T14:15:12.07+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10Actively ExploitedEPSS 100.00%

Last modified Jun 17, 2026

CVE-2019-19781 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 100.00% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

100.00%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Citrix	Application Delivery Controller Firmware	10.5
Citrix	Application Delivery Controller Firmware	11.1
Citrix	Application Delivery Controller Firmware	12.0
Citrix	Application Delivery Controller Firmware	12.1
Citrix	Application Delivery Controller Firmware	13.0
Citrix	Netscaler Gateway Firmware	10.5
Citrix	Netscaler Gateway Firmware	11.1
Citrix	Netscaler Gateway Firmware	12.0
Citrix	Netscaler Gateway Firmware	12.1
Citrix	Gateway Firmware	13.0

References

http://packetstormsecurity.com/files/155904/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/155905/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution-Traversal.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/155930/Citrix-Application-Delivery-Controller-Gateway-10.5-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/155947/Citrix-ADC-NetScaler-Directory-Traversal-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/155972/Citrix-ADC-Gateway-Path-Traversal.htmlThird Party Advisory, VDB Entry
https://badpackets.net/over-25000-citrix-netscaler-endpoints-vulnerable-to-cve-2019-19781/Broken Link, Third Party Advisory
https://forms.gle/eDf3DXZAv96oosfj6Third Party Advisory
https://support.citrix.com/article/CTX267027Vendor Advisory
https://twitter.com/bad_packets/status/1215431625766424576Broken Link, Third Party Advisory
https://www.kb.cert.org/vuls/id/619785Third Party Advisory, US Government Resource
http://packetstormsecurity.com/files/155904/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/155905/Citrix-Application-Delivery-Controller-Gateway-Remote-Code-Execution-Traversal.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/155930/Citrix-Application-Delivery-Controller-Gateway-10.5-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/155947/Citrix-ADC-NetScaler-Directory-Traversal-Remote-Code-Execution.htmlThird Party Advisory, VDB Entry
http://packetstormsecurity.com/files/155972/Citrix-ADC-Gateway-Path-Traversal.htmlThird Party Advisory, VDB Entry
https://badpackets.net/over-25000-citrix-netscaler-endpoints-vulnerable-to-cve-2019-19781/Broken Link, Third Party Advisory
https://forms.gle/eDf3DXZAv96oosfj6Third Party Advisory
https://support.citrix.com/article/CTX267027Vendor Advisory
https://twitter.com/bad_packets/status/1215431625766424576Broken Link, Third Party Advisory
https://www.kb.cert.org/vuls/id/619785Third Party Advisory, US Government Resource
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-19781US Government Resource

Timeline

Published: Dec 27, 2019
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2019-19781?

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.

How severe is CVE-2019-19781?

CVE-2019-19781 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 100.00% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2019-19781?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-19781?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST