CVE-2019-19781

CRITICAL
2019-12-27 [email protected]
9.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Mar 26, 2026 - 11:19 vuln.today
PoC Detected
Nov 07, 2025 - 19:37 vuln.today
Public exploit code
Added to CISA KEV
Nov 07, 2025 - 19:37 cisa
CISA KEV
CVE Published
Dec 27, 2019 - 14:15 nvd
CRITICAL 9.8

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.

Analysis

Citrix Application Delivery Controller and Gateway contain a directory traversal vulnerability allowing unauthenticated remote code execution, known as 'Shitrix', that triggered a global exploitation crisis in January 2020.

Technical Context

The CWE-22 path traversal in Citrix's NSPPE (Netscaler Perl Extension) allows attackers to write files to arbitrary directories through crafted requests. By writing a Perl template file to the web-accessible cron scripts directory, attackers achieve code execution as the web server user.

Affected Products

['Citrix ADC and Gateway 10.5', 'Citrix ADC and Gateway 11.1', 'Citrix ADC and Gateway 12.0', 'Citrix ADC and Gateway 12.1', 'Citrix ADC and Gateway 13.0']

Remediation

Apply Citrix security updates. Verify no backdoors were installed during the exploitation window. Check for unauthorized users, modified configurations, and web shells. Rotate all credentials accessible from the Citrix appliance.

Priority Score

223
Low Medium High Critical
KEV: +50
EPSS: +94.4
CVSS: +49
POC: +20

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CVE-2019-19781 vulnerability details – vuln.today
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