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CVE-2021-22956

HIGHCVSS 7.5/10EPSS 0.89%

Last modified

CVE-2021-22956 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An uncontrolled resource consumption vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 that could allow an attacker with access to NSIP or SNIP with management interface access to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.. EPSS estimates a 0.89% chance of exploitation in the next 30 days.

Description

An uncontrolled resource consumption vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 that could allow an attacker with access to NSIP or SNIP with management interface access to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.

Metrics

CVSS 3.1
7.5/10

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

EPSS Probability
0.89%

54.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CitrixApplication Delivery Controller Firmware< 11.1-65.23
CitrixApplication Delivery Controller Firmware>= 12.1, < 12.1-63.22
CitrixApplication Delivery Controller Firmware>= 13.0, < 13.0-83.27
CitrixGateway< 11.1-65.23
CitrixGateway>= 12.1, < 12.1-63.22
CitrixGateway>= 13.0, < 13.0-65.23
CitrixSd-Wan< 10.2.9c
CitrixSd-Wan>= 11.4.0, < 11.4.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-22956?
An uncontrolled resource consumption vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 that could allow an attacker with access to NSIP or SNIP with management interface access to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.
How severe is CVE-2021-22956?
CVE-2021-22956 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22956?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22956?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST