Is CVE-2021-22956 in the CISA KEV catalog?

No. CVE-2021-22956 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22956?

CVE-2021-22956 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-22956?

CVE-2021-22956 has an EPSS score of 0.89% (55th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22956?

Upgrade application delivery controller firmware to 13.0-83.27 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22956

HIGH

7.5

CVSS v3

NVD

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.

CWE-400Resource Exhaustion

How to fix

Remediation Available

application delivery controller firmwareNVD

Affected:>= 13.0, < 13.0-83.27Fixed in:13.0-83.27CVE-2021-22956derived from NVD

gatewayNVD

Affected:>= 13.0, < 13.0-65.23Fixed in:13.0-65.23CVE-2021-22956derived from NVD

sd-wanNVD

Affected:>= 11.4.0, < 11.4.2Fixed in:11.4.2CVE-2021-22956derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.89%probability of exploitation in 30 days

55thpercentile

Moderate risk: more likely to be exploited than 55% of all known CVEs.

References

Vendor Advisory1

support.citrix.com

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.