CVE-2021-22927Network attack vector

Authenticated SAML session hijacking via session fixation

Published Aug 5, 2021 · Updated Aug 3, 2024

Session fixation in Citrix ADC and Citrix Gateway 13.0 before 13.0-82.45 allows remote authenticated users to hijack SAML sessions. Citrix has not published the specific SAML service-provider session-handling operation that permits an authorized user to fix another user's session identifier. Exposure requires SAML service-provider configuration; successful exploitation assumes the victim's authenticated identity and can read or alter data available to that session.

CVSS severity8.1
High
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Session fixation in Citrix ADC and Citrix Gateway 13.0 before 13.0-82.45 allows remote authenticated users to hijack SAML sessions. Citrix has not published the specific SAML service-provider session-handling operation that permits an authorized user to fix another user's session identifier. Exposure requires SAML service-provider configuration; successful exploitation assumes the victim's authenticated identity and can read or alter data available to that session.

The record

CVE
CVE-2021-22927
Published
Aug 5, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-384
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 5, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-384Session Fixation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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