CVE-2021-22956: citrix application_delivery_controller Uncontrolled Resource Consumption
Vulnerability summary
CVE-2021-22956 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in citrix application_delivery_controller. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 59.6% of scored vulnerabilities.
Timeline
- 07-12-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
0.92%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
+0.03 pp
From 0.89% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Citrix3 products
- application_delivery_controller< 11.1-65.23 | ≥ 12.1, < 12.1-63.22 | ≥ 13.0, < 13.0-83.27
- gateway< 11.1-65.23 | ≥ 12.1, < 12.1-63.22 | ≥ 13.0, < 13.0-65.23
- sd-wan< 10.2.9c | ≥ 11.4.0, < 11.4.2
1 vendor · 3 products