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SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.
SERVER-WEBAPP Citrix ADC and Gateway arbitrary code execution attempt
This event is generated when a remote code execution attempt is detected against Citrix ADC and Citrix Gateway. Impact: Web Application Attack Details: This rule looks for any connection attempt to the uri "/vpns/" that contains a directory traversal attempt using "/../". Ease of Attack:
This event is generated when a remote code execution attempt is detected against Citrix ADC and Citrix Gateway.
No public information
No known false positives
Cisco Talos Intelligence Group
No rule groups
Directory Traversal
A Directory Traversal attack targets HTTP traffic and allows the attacker to access directories outside the applications own, potentially exposing sensitive system files to leakage or overwriting. This is also known as Directory Climbing, Path Traversal, or Backtracking. An alert on this kind of attack indicates a vulnerability in security validation of user input that allows a "traverse to parent directory" or "../" command to pass through. Protect your site by filtering all user input, removing any characters but the allowed data.
CVE-2019-19781 |
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Tactic: Initial Access
Technique: Exploit Public-Facing Application
For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org
©2026 Cisco and/or its affiliates. Snort, the Snort and Pig logo are registered trademarks of Cisco. All rights reserved.