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CVE-2021-22919

24
FAUCET Score

CVE-2021-22919 is a high-severity vulnerability affecting Citrix ADC, Citrix Gateway, and specific Citrix SD-WAN WANOP Edition models. This flaw allows an unauthenticated attacker to remotely exhaust the appliance's disk space, leading to a denial of service. While rated 7.5 CVSS, there is currently no public exploit code, active exploitation, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 11.1, < 11.1-65.22CPE matchmatch criteria
cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
>= 12.1, < 12.1-62.27CPE matchmatch criteria
cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
>= 13.0, < 13.0-82.45CPE matchmatch criteria
cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
>= 12.1, < 12.1-55.238CPE matchmatch criteria
cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
>= 12.1, < 12.1-62.27CPE matchmatch criteria
cpe:2.3:a:citrix:gateway:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.94%
Probability of exploitation in next 30 days
EPSS Percentile
57.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0094 is in the 32nd percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

citrixvendor investigatingvia nvd_reference
View patch

References

support.citrix.com / article/CTX319135
Vendor Advisory