CVE-2019-12044: Citrix NetScaler Application Delivery Controller Firmware

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

A Buffer Overflow exists in Citrix NetScaler Gateway 10.5.x before 10.5.70.x, 11.1.x before 11.1.59.10, 12.0.x before 12.0.59.8, and 12.1.x before 12.1.49.23 and Citrix Application Delivery Controller 10.5.x before 10.5.70.x, 11.1.x before 11.1.59.10, 12.0.x before 12.0.59.8, and 12.1.x before 12.1.49.23.

Affected products

• Citrix NetScaler Application Delivery Controller Firmware: from 10.5.0, before 10.5.70 (fixed in 10.5.70); from 11.1.0, before 11.1.59.10 (fixed in 11.1.59.10); from 12.0.0, before 12.0.59.8 (fixed in 12.0.59.8); from 12.1.0, before 12.1.49.23 (fixed in 12.1.49.23)
• Citrix NetScaler Gateway Firmware: from 10.5.0, before 10.5.70 (fixed in 10.5.70); from 11.1.0, before 11.1.59.10 (fixed in 11.1.59.10); from 12.0.0, before 12.0.59.8 (fixed in 12.0.59.8); from 12.1.0, before 12.1.49.23 (fixed in 12.1.49.23)

Published 2019-05-22. Last modified 2026-06-17.