CVE-2021-22955

7.5 highEPSS 0.9%

High (7.5) in citrix. EPSS 0.9% chance of exploitation in the next 30 days.

A unauthenticated denial of service vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 when configured as a VPN (Gateway) or AAA virtual server could allow an attacker to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 60% of CVEs (scores of 2026-10-31)
CWE: CWE-400
Published: 2021-12-07
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

citrix:application_delivery_controller_firmware
citrix:gateway

References

https://support.citrix.com/article/CTX330728
https://support.citrix.com/article/CTX330728

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