Citrix · Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance
CVE-2020-8193
Citrix ADC, Gateway, and SD-WAN WANOP Appliance Authorization Bypass Vulnerability
What it is
Improper access control in Citrix ADC and Citrix Gateway versions before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18 and Citrix SDWAN WAN-OP versions before 11.1.1a, 11.0.3d and 10.2.7 allows unauthenticated access to certain URL endpoints.
CISA: Citrix ADC, Citrix Gateway, and multiple Citrix SD-WAN WANOP appliance models contain an authorization bypass vulnerability that may allow unauthenticated access to certain URL endpoints. The attacker must have access to the NetScaler IP (NSIP) in order to perform exploitation.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: May 3, 2022
More exploited flaws from Citrix
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Nov 3, 2021 | ADC, Gateway, and SD-WAN WANOP Appliance Information Disclosure | Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance | Medium 6.5 | 33% |
| Nov 3, 2021 | ADC, Gateway, and SD-WAN WANOP Appliance Information Disclosure | Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance | Medium 4.3 | 26% |
| Nov 3, 2021 | ADC, Gateway, and SD-WAN WANOP Appliance Code Execution | Application Delivery Controller (ADC), Gateway, and SD-WAN WANOP Appliance | Critical 9.8 | >99.9% |
| 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% |
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.