Vulnerability in Citrix Application Delivery Management

CVE-2021-22920

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 a phishing attack through a SAML authentication hijack to steal a valid user session.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-22920: held from 0.009 to 0.009.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

  • Citrix Application Delivery Management — versions 12.1-62.25, 13.0-82.42
  • Citrix Gateway — versions 12.1-62.25, 13.0-82.42
  • Citrix Adc, Gateway — versions Citrix ADC and Citrix Gateway 13.0-82.45 and later releases of 13.0, Citrix ADC and Citrix Gateway 12.1-62.27 and later releases of 12.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-22920?
CVE-2021-22920 is a medium-severity vulnerability in Citrix Application Delivery Management, classified under Improper Access Control. CVSS score: 6.5/10. Published 2021-08-05.
How severe is CVE-2021-22920?
Medium severity. CVSS v3 base score is 6.5 out of 10.