Is CVE-2021-22919 in the CISA KEV catalog?

No. CVE-2021-22919 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-22919?

CVE-2021-22919 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-22919?

CVE-2021-22919 has an EPSS score of 0.94% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-22919?

Upgrade application delivery controller firmware to 12.1-55.238 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-22919

HIGH

7.5

CVSS v3

NVD

Description

A vulnerability has been discovered in Citrix ADC (formerly known as NetScaler ADC) and Citrix Gateway (formerly known as NetScaler Gateway), and Citrix SD-WAN WANOP Edition models 4000-WO, 4100-WO, 5000-WO, and 5100-WO. These vulnerabilities, if exploited, could lead to the limited available disk space on the appliances being fully consumed.

CWE-770Allocation of Resources Without Limits or Throttling

How to fix

Remediation Available

application delivery controller firmwareNVD

Affected:>= 12.1, < 12.1-55.238Fixed in:12.1-55.238CVE-2021-22919derived from NVD

gatewayNVD

Affected:>= 13.0, < 13.0-82.45Fixed in:13.0-82.45CVE-2021-22919derived from NVD

netscaler gatewayNVD

Affected:>= 11.1, < 11.1-65.22Fixed in:11.1-65.22CVE-2021-22919derived from NVD

sd-wan wanopNVD

Affected:>= 11.4, < 11.4.0.aFixed in:11.4.0.aCVE-2021-22919derived 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

0.94%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Vendor Advisory1

support.citrix.com

Related Vulnerabilities

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-50387	High	7.5	100%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2019-11479	High	7.5	92%	-	Fix
CVE-2024-27316	High	7.5	91%	-	Fix
CVE-2022-30522	High	7.5	90%	-	Fix
CVE-2019-9515	High	7.5	88%	-	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.