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Vulnerabilities

Vulnerability · CVE-2021-22927

A session fixation vulnerability exists in Citrix ADC and Citrix Gateway 13.0-82.45 when configured SAML service provider that could allow an attacker to hijack a session.

Published Aug 5, 2021 · catalog updated Jun 17, 2026 · application delivery controller firmware

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-22927. EPSS is 0.84%. Act only if a listed version of application delivery controller firmware is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.84%
Remediation
Version ranges on file
Affected products
cpe citrix/application delivery controller firmware · cpe citrix/gateway

A session fixation vulnerability exists in Citrix ADC and Citrix Gateway 13.0-82.45 when configured SAML service provider that could allow an attacker to hijack a session.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe citrix/application delivery controller firmware< 11.1-65.22
  • cpe citrix/application delivery controller firmware< 12.1-55.238
  • cpe citrix/application delivery controller firmware< 12.1-62.27
  • cpe citrix/application delivery controller firmware< 13.0-82.45
  • cpe citrix/gateway< 12.1-62.27
  • cpe citrix/gateway< 13.0-82.45

How to fix CVE-2021-22927

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-22927. EPSS is 0.84%. Act only if a listed version of application delivery controller firmware is installed.

Which versions are affected?

Compare what you have installed with citrix/application delivery controller firmware < 11.1-65.22; citrix/application delivery controller firmware < 12.1-55.238; citrix/application delivery controller firmware < 12.1-62.27; citrix/application delivery controller firmware < 13.0-82.45. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-384. EPSS 0.84%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Citrix NetScaler ADC / Gateway security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 5, 2021 · Monitored products — critical

    Detected

    A session fixation vulnerability exists in Citrix ADC and Citrix Gateway 13.0-82.45 when configured SAML service provider that could allow an attacker to hijack a session.

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    A session fixation vulnerability exists in Citrix ADC and Citrix Gateway 13.0-82.45 when configured SAML service provider that could allow an attacker to hijack a session.

Sources

  • CVE.orgVulnerability recordCVE-2021-22927

    Official CVE identifier

    cve.org
  • Monitored products — criticalVendor advisoryCVE-2021-22927

    A session fixation vulnerability exists in Citrix ADC and Citrix Gateway 13.0-82.45 when configured SAML service provider that could allow an attacker to hijack a session.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgNov 4, 2026
  • Monitored products — criticalNov 2, 2026