CVE-2019-12991: Citrix SD-WAN and NetScaler Command Injection Vulnerability

Vulnerability summary

CVE-2019-12991 is a high (CVSS 9.0) OS Command Injection vulnerability in Citrix SD-WAN and NetScaler. It is known to be exploited: CISA lists it, first on 25-03-2022. EPSS estimates a 74.46% chance of exploitation in the next 30 days, higher than 99.4% of scored vulnerabilities. 3 public exploits are recorded.

Timeline

1. 16-07-2019
   PublishedVulnerability first disclosed.
2. 25-03-2022
   Added to CISA KEVCitrix SD-WAN and NetScaler Command Injection Vulnerability
3. 15-04-2022
   CISA remediation dueApply updates per vendor instructions.
4. 21-10-2025
   Last modifiedVulnerability information updated.

Description

Citrix SD-WAN 10.2.x before 10.2.3 and NetScaler SD-WAN 10.0.x before 10.0.8 have Improper Input Validation (issue 5 of 6).

• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.