← Vulnerability feed

Vulnerability record · CVE-2021-22927 · published 5 August 2021

CVE-2021-22927: Citrix application delivery controller firmware vulnerability

Citrix · Application Delivery Controller Firmware

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.

8.1 CVSS 3.1 High EPSS 0.84% · top 43.9% CWE-384 · CWE-384
8.1CVSS 3.1 base score, v2 5.8
0.84%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.citrix.com/article/CTX319135 Vendor Advisory
https://support.citrix.com/article/CTX319135 Vendor Advisory

Track CVE-2021-22927 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-3519Citrix NetScaler ADC and Gateway unauthenticated code injectionCitrix NetScaler ADC and NetScaler Gateway contain a code injection flaw (CWE-94) that allows unauthenticated remote code execution. The vendor bulle…KEVEPSS 100%analysed9.8CVE-2022-27518Citrix ADC and Gateway unauthenticated remote code executionCVE-2022-27518 is an unauthenticated remote arbitrary code execution flaw in Citrix Application Delivery Controller (ADC) and Gateway firmware. The C…KEVEPSS 6.7%analysed9.8CVE-2019-19781Citrix ADC and Gateway directory traversal enabling code executionCitrix Application Delivery Controller (ADC) and Gateway versions 10.5, 11.1, 12.0, 12.1, and 13.0 contain a directory traversal flaw (CWE-22). The t…KEVEPSS 100%analysed9.3CVE-2026-19490Citrix NetScaler ADC and Gateway authentication bypass via alternate pathNetScaler ADC and NetScaler Gateway contain an authentication bypass via an alternate path or channel (CWE-288). The flaw is remotely reachable witho…KEVEPSS 7.0%analysed9.3CVE-2026-3055Citrix NetScaler ADC and Gateway SAML IDP memory overreadNetScaler ADC and NetScaler Gateway, when configured as a SAML identity provider, fail to validate input sufficiently, causing an out-of-bounds memor…KEVEPSS 4.0%analysed9.3CVE-2025-5777Citrix NetScaler ADC/Gateway memory overread via insufficient input validationCVE-2025-5777 is an insufficient input validation flaw in Citrix NetScaler ADC and NetScaler Gateway that causes a memory overread when the appliance…KEVEPSS 100%analysed9.2CVE-2025-7775Citrix NetScaler memory overflow allows remote code executionNetScaler ADC and NetScaler Gateway contain a memory buffer overflow (CWE-119) that can lead to remote code execution or denial of service. It affect…KEVEPSS 20%analysed9.2CVE-2025-6543Citrix NetScaler ADC and Gateway memory overflow allows control flow hijack and DoSNetScaler ADC and NetScaler Gateway contain a memory buffer overflow (CWE-119) that causes unintended control flow and denial of service. It affects …KEVEPSS 11%analysed

Source: NIST National Vulnerability Database (record CVE-2021-22927), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.