CVE-2021-22955

Published on: 12/07/2021 12:00:00 AM UTC

Last Modified on: 12/08/2021 07:43:00 PM UTC

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

Certain versions of Application Delivery Controller from Citrix contain the following vulnerability:

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.

  • CVE-2021-22955 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.

CVSS3 Score: 7.5 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED NONE NONE HIGH

CVSS2 Score: 4.3 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
NONE NONE PARTIAL

CVE References

Description Tags Link
Citrix Application Delivery Controller, Citrix Gateway, and Citrix SD-WAN WANOP Edition appliance Security Update support.citrix.com
text/html
URL Logo MISC support.citrix.com/article/CTX330728

Related QID Numbers

  • 376084 Citrix ADC and NetScaler Gateway Temporary disruption of the Management GUI Vulnerability (CTX330728)
  • 376085 Citrix ADC and Citrix Gateway Unauthenticated Denial of Service (DoS) Vulnerability (CTX330728)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
HardwareCitrixApplication Delivery Controller-AllAllAll
Operating
System
CitrixApplication Delivery Controller FirmwareAllAllAllAll
Operating
System
CitrixApplication Delivery Controller FirmwareAllAllAllAll
ApplicationCitrixGatewayAllAllAllAll
  • cpe:2.3:h:citrix:application_delivery_controller:-:*:*:*:*:*:*:*:
  • cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*:
  • cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:citrix:gateway:*:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @cloudDNA Heads up! New Citrix #ADC (#NetScaler) #CVE announced - CVE-2021-22955 and CVE-2021-22956. Critical for #VPN and… twitter.com/i/web/status/1… 2021-11-09 14:15:17
Twitter Icon @Ryan_C_Butler CVE-2021-22955 (support.citrix.com/article/CTX331…) Use grep to pull the MaxClients value (make sure to test!)… twitter.com/i/web/status/1… 2021-11-09 15:22:10
Twitter Icon @Schnabelewobski Seems Citrix.com has collapsed under the load of admins frantically trying to download the fixed firmware. #CVE-2021-22955 2021-11-09 17:00:13
Twitter Icon @carlbehrent Citrix ADC - Unauthenticated Denial of Service - CVE-2021-22955 support.citrix.com/article/CTX330… 2021-11-09 17:55:03
Twitter Icon @IFTECHAG Weiterer Hinweis zu #Citrix Sicherheitslücken CVE-2021-22955 bzw. 22956: Bei einzelnen Kunden gibt es nach dem Upgr… twitter.com/i/web/status/1… 2021-11-10 09:01:56
Twitter Icon @DCIS_SUND Varsel! ?KRITIKALITET: Høj risiko (Orange)? CVE-2021-22955 Der er blevet identificeret sårbarheder i Citrix ADC (… twitter.com/i/web/status/1… 2021-11-10 09:48:52
Twitter Icon @autumn_good_35 CVE-2021-22955 、CVE-2021-22956 CTX330728 Citrix Application Delivery Controller, Citrix Gateway, and Citrix SD-WAN… twitter.com/i/web/status/1… 2021-11-10 12:32:59
Twitter Icon @SystemTek_UK Citrix Patches Critical Vulnerability in ADC Gateway [CVE-2021-22955 and CVE-2021-22956] systemtek.co.uk/2021/11/citrix… 2021-11-11 08:55:04
Twitter Icon @6townstechteam Citrix Patches Critical Vulnerability in ADC Gateway [CVE-2021-22955 and CVE-2021-22956] systemtek.co.uk/2021/11/citrix… 2021-11-11 08:55:05
Twitter Icon @securezoo Citrix addresses Critical DoS vulnerability (CVE-2021-22955) in ADC and Citrix Gateway products… twitter.com/i/web/status/1… 2021-11-11 21:05:03
Twitter Icon @StefanosCloud Citrix ADC security vulnerabilities description A new security vulnerability with ID CVE-2021-22955 (Unauthenticat… twitter.com/i/web/status/1… 2021-11-15 14:35:50
Twitter Icon @jantytgat #BugAlert for #CitrixADC 12.1 63.23 (latest build addressing CVE-2021-22955): if you have a #syslog action based on… twitter.com/i/web/status/1… 2021-11-30 21:22:42
Twitter Icon @ipssignatures The vuln CVE-2021-22955 has a tweet created 0 days ago and retweeted 11 times. twitter.com/jantytgat/stat… #pow1rtrtwwcve 2021-12-01 12:06:00
Twitter Icon @CVEreport CVE-2021-22955 : A unauthenticated denial of service vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 an… twitter.com/i/web/status/1… 2021-12-07 14:08:33
Reddit Logo Icon /r/netcve CVE-2021-22955 2021-12-07 15:38:54
© CVE.report 2022 Twitter Nitter Twitter Viewer |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

CVE.report and Source URL Uptime Status status.cve.report