CVE-2021-22955
First published: Tue Dec 07 2021(Updated: )
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.
Credit: support@hackerone.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Citrix Application Delivery Controller Firmware | <=11.1-65.23 | |
| Citrix Application Delivery Controller Firmware | >=12.1<12.1-63.22 | |
| Citrix Application Delivery Controller Firmware | >=13.0<13.0-83.27 | |
| Citrix Application Delivery Controller | ||
| Citrix Gateway | <11.1-65.23 | |
| Citrix Gateway | >=12.1<12.1-63.22 | |
| Citrix Gateway | >=13.0<13.0-83.27 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-22955?
CVE-2021-22955 is an unauthenticated denial of service vulnerability that 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.
How does CVE-2021-22955 impact Citrix ADC?
CVE-2021-22955 can cause a temporary disruption of the Management GUI, Nitro API, and RPC communication on Citrix ADC when configured as a VPN (Gateway) or AAA virtual server.
What is the severity of CVE-2021-22955?
CVE-2021-22955 has a severity rating of 7.5 (high).
Which versions of Citrix ADC are affected by CVE-2021-22955?
Citrix ADC versions <13.0-83.27, <12.1-63.22, and 11.1-65.23 are affected by CVE-2021-22955.
How can I fix CVE-2021-22955?
To fix CVE-2021-22955, it is recommended to upgrade to a version of Citrix ADC that is not affected by the vulnerability. Check the Citrix support article for detailed instructions.
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- agent/author
- agent/severity
- agent/references
- agent/weakness
- agent/tags
- agent/type
- agent/description
- agent/event
- agent/last-modified-date
- agent/softwarecombine
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- vendor/citrix
- canonical/citrix application delivery controller firmware
- version/citrix application delivery controller firmware/11.1-65.23
- version/citrix application delivery controller firmware/12.1
- version/citrix application delivery controller firmware/13.0
- canonical/citrix application delivery controller
- canonical/citrix gateway
- version/citrix gateway/12.1
- version/citrix gateway/13.0