Application Delivery Controller FirmwareOperating system · Citrix
CVE-2021-22927
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceCitrix ADC and Citrix Gateway 13.0-82.45 contain a session fixation vulnerability when configured as a SAML service provider. An attacker can potentially set or fix a user's session ID before authentication and then hijack the authenticated session, gaining unauthorized access.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Application Delivery Controller FirmwareOperating system
>= 11.1, < 11.1-65.22>= 12.1, < 12.1-62.27>= 13.0, < 13.0-82.45>= 12.1, < 12.1-55.238
GatewayApplication
>= 12.1, < 12.1-62.27>= 13.0, < 13.0-82.45
Netscaler GatewayApplication
>= 11.1, < 11.1-65.22CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the device product and firmware versionLog into the Citrix ADC/Gateway CLI and run 'show version' or access the GUI under System > Information to view the firmware build numberAffected if The version falls within any of these ranges: 11.1 before 65.22, 12.1 before 62.27 (or before 55.238 for certain builds), or 13.0 before 82.45
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Confirm the device is configured as a SAML Service ProviderIn the CLI run 'show samlIdpProfile' or 'show samlSPProfile' to list SAML configurations; in the GUI navigate to Citrix Gateway > SAML IdP or SAML SP to verify if any SAML service provider profile existsAffected if A SAML SP (Service Provider) profile is configured on the device
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Verify SAML SP session handling settingsRun 'show samlSPProfile <profile_name>' or inspect the SAML SP configuration in the GUI under SAML SP settings to check if session tokens are being regenerated after authenticationAffected if Session ID is not being regenerated post-authentication (this confirms the vulnerable configuration pattern for this CVE)
A device is affected if it is running a Citrix ADC, Citrix Gateway, or Netscaler Gateway firmware version in the affected ranges AND has a SAML Service Provider profile configured, enabling an attacker to fix the session ID before authentication.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor data11.1-65.2212.1-55.23812.1-62.27
Upgrade Citrix ADC and Citrix Gateway to a patched version beyond 13.0-82.45. For immediate mitigation, review SAML SP session handling configurations and consider implementing session ID regeneration after authentication.
Fix this in Application Delivery Controller Firmware
Scoped from the published advisory
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-22927 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-22927 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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