CVE-2021-22955

published 2021-12-07

CVE-2021-22955: 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…

Priority P3 41 high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

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.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
citrix	application_delivery_controller_firmware	<= 11.1-65.23	—
citrix	application_delivery_controller_firmware	>= 12.1 < 12.1-63.22	12.1-63.22
citrix	application_delivery_controller_firmware	>= 13.0 < 13.0-83.27	13.0-83.27
citrix	citrix_adc	—	—
citrix	citrix_application_delivery_controller	—	—
citrix	citrix_gateway	—	—
citrix	citrix_sd-wan_wanop	—	—
citrix	gateway	< 11.1-65.23	11.1-65.23
citrix	gateway	>= 12.1 < 12.1-63.22	12.1-63.22
citrix	gateway	>= 13.0 < 13.0-83.27	13.0-83.27
citrix	netscaler_adc	—	—
citrix	netscaler_gateway	—	—
citrix	sd-wan	—	—
citrix	xenserver	—	—

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd v2.0 4.3 MEDIUM AV:N/AC:M/Au:N/C:N/I:N/A:P

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-400