CVE-2021-22955

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

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

CVE-2021-22955

Source: Mitre Source: NIST CVE.ORG Print: PDF PDF
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
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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
Hardware Device InfoCitrixApplication 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
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