CVE-2020-8187

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-07-10 · updated 2026-06-17
Weakness: CWE-20

Description

Improper input validation in Citrix ADC and Citrix Gateway versions before 11.1-63.9 and 12.0-62.10 allows unauthenticated users to perform a denial of service attack.

Affected products

Citrix Application Delivery Controller Firmware: from 11.1 before 11.1-63.9; from 12.0 before 12.0-62.10 — fixed in 11.1-63.9, 12.0-62.10
Citrix Netscaler Gateway Firmware: from 11.1 before 11.1-63.9; from 12.0 before 12.0-62.10 — fixed in 11.1-63.9, 12.0-62.10
Citrix ADC, Citrix Gateway: 11.1-63.9, 12.0-62.10

How to fix

Upgrade to a fixed version: Citrix Application Delivery Controller Firmware 11.1-63.9, 12.0-62.10; Citrix Netscaler Gateway Firmware 11.1-63.9, 12.0-62.10. Check the vendor advisory for mitigations.

References

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