CVE-2020-8246

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-09-18 · updated 2026-06-17
Weakness: CWE-400

Description

Citrix ADC and Citrix Gateway 13.0 before 13.0-64.35, Citrix ADC and NetScaler Gateway 12.1 before 12.1-58.15, Citrix ADC 12.1-FIPS before 12.1-55.187, Citrix ADC and NetScaler Gateway 12.0, Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.12, Citrix SD-WAN WANOP 11.2 before 11.2.1a, Citrix SD-WAN WANOP 11.1 before 11.1.2a, Citrix SD-WAN WANOP 11.0 before 11.0.3f, Citrix SD-WAN WANOP 10.2 before 10.2.7b are vulnerable to a denial of service attack originating from the management network.

Affected products

Citrix Application Delivery Controller Firmware: from 11.1 before 11.1-65.12; from 12.1 before 12.1-58.15; from 13.0 before 13.0-64.35 — fixed in 11.1-65.12, 12.1-58.15, 13.0-64.35
NetScaler Gateway: from 11.1 before 11.1-65.12; from 13.0 before 13.0-64.35 — fixed in 11.1-65.12, 13.0-64.35
Citrix NetScaler Gateway: from 12.1 before 12.1-58.15 — fixed in 12.1-58.15
Citrix Sd-Wan Wanop: from 10.2 before 10.2.7b; from 11.0 before 11.0.3f; from 11.1 before 11.1.2a; from 11.2 before 11.2.1a — fixed in 10.2.7b, 11.0.3f, 11.1.2a, 11.2.1a
Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP: Citrix ADC and Citrix Gateway 13.0 before 13.0-64.35, Citrix ADC and NetScaler Gateway 12.1 before 12.1-58.15, Citrix ADC 12.1-FIPS before 12.1-55.187, Citrix ADC and NetScaler Gateway 12.0, Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.12, Citrix SD-WAN WANOP 11.2 before 11.2.1a, Citrix SD-WAN WANOP 11.1 before 11.1.2a, Citrix SD-WAN WANOP 11.0 before 11.0.3f, Citrix SD-WAN WANOP 10.2 before 10.2.7b

How to fix

Upgrade to a fixed version: Citrix Application Delivery Controller Firmware 11.1-65.12, 12.1-58.15, 13.0-64.35; NetScaler Gateway 11.1-65.12, 13.0-64.35; Citrix NetScaler Gateway 12.1-58.15; Citrix Sd-Wan Wanop 10.2.7b, 11.0.3f, 11.1.2a, 11.2.1a. Check the vendor advisory for mitigations.

References

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