7.5

CVE-2021-22955: citrix application_delivery_controller Uncontrolled Resource Consumption

CVSS: 7.5v3.1HighModified
Published 07-12-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-22955 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 59.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.92%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 07-12-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A unauthenticated denial of service vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 when configured as a VPN (Gateway) or AAA virtual server could allow an attacker to cause a temporary disruption of the Management GUI, Nitro API, and RPC communication.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS 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 18-09-2026

18-09-202618-10-2026
EPSS score
0.92%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Citrix2 products

1 vendor · 2 products

References

1 links