Citrix SD-WAN - RCE (CVE-2019-12986)

CVE-2019-12986 is a critical vulnerability in Citrix SD-WAN and NetScaler SD-WAN products due to improper input validation, allowing remote attackers to potentially execute arbitrary code without authentication. This flaw could be exploited to fully compromise affected systems, leading to unauthorized access, data theft, or service disruption.

CrowdSec has been tracking this vulnerability and its exploits since 11th of February 2026.

Data from the CrowdSec community indicates that exploitation of CVE-2019-12986 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. In addition, according to the CrowdSec network, attack volume against CVE-2019-12986 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.

Attackers exploit this vulnerability by sending crafted POST requests to the /Collector/diagnostics/trace_route endpoint, injecting malicious commands via the ipAddress parameter to achieve remote code execution.