Citrix · SD-WAN and NetScaler
CVE-2019-12991
Citrix SD-WAN and NetScaler Command Injection Vulnerability
Exploited in attacks
High 8.8 Attack chance: 74%
What it is
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).
CISA: Authenticated Command Injection in Citrix SD-WAN Appliance and NetScaler SD-WAN Appliance.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: April 15, 2022
More exploited flaws from Citrix
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Mar 25, 2022 | SQL Injection | SD-WAN and NetScaler | Critical 9.8 | 95% |
| Oct 4, 2026 | Improper Restriction of Operations within the Bounds of a Memory Buffer | NetScaler | High 8.7 | 11% |
| Sep 27, 2026 | Improper Input Validation | NetScaler | Critical 9.5 | 82% |
| Sep 27, 2026 | Improper Restriction of Operations within the Bounds of a Memory Buffer | NetScaler | Critical 9.5 | 78% |
| Sep 9, 2026 | Authentication Bypass Using an Alternate Path or Channel | NetScaler | Critical 9.3 | 33% |
| Aug 26, 2026 | Improper Restriction of Operations within the Bounds of a Memory Buffer | NetScaler ADC and NetScaler Gateway | High 8.8 | 1.0% |
| Mar 30, 2026 | Out-of-Bounds Read | NetScaler | Critical 9.3 | 91% |
| Aug 26, 2025 | Memory Overflow | NetScaler | Critical 9.2 | 21% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.