CVE-2021-22927
CVE-2021-22927 is a high-severity vulnerability in Citrix Gateway with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-384.
Key facts
- Severity: High (CVSS 3.x base score 8.1)
- CVSS v2: 5.8
- EPSS exploit prediction: 1% (53rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-384
- Affected product: Citrix Gateway
- Published:
- Last modified:
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.
Frequently asked questions
- What is 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.
- How severe is CVE-2021-22927?
- CVE-2021-22927 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2021-22927 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-22927?
- CVE-2021-22927 primarily affects Citrix Gateway. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-22927?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-22927 published?
- CVE-2021-22927 was published on 2021-08-05 and last updated on 2026-06-17.
References
Affected products (3)
- cpe:2.3:o:citrix:application_delivery_controller_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:a:citrix:gateway:*:*:*:*:*:*:*:*
- cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*
More vulnerabilities in Citrix Gateway
- CVE-2022-27510 — Critical (CVSS 9.8): Unauthorized access to Gateway user capabilities
- CVE-2020-8247 — High (CVSS 8.8): Citrix ADC and Citrix Gateway 13.0 before 13.0-64.35, Citrix ADC and NetScaler Gateway 12.1 before 12.1-58.15, Citrix…
- CVE-2022-27513 — High (CVSS 8.3): Remote desktop takeover via phishing
- CVE-2022-27508 — High (CVSS 7.5): Unauthenticated denial of service
- CVE-2021-22956 — High (CVSS 7.5): An uncontrolled resource consumption vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 that…
- CVE-2021-22955 — High (CVSS 7.5): A unauthenticated denial of service vulnerability exists in Citrix ADC <13.0-83.27, <12.1-63.22 and 11.1-65.23 when…
All CVEs affecting Citrix Gateway →
Other CWE-384 (Session Fixation) vulnerabilities
- CVE-2024-11317 — Critical (CVSS 10.0): Session Fixation vulnerabilities allow an attacker to fix a users session identifier before login providing an…
- CVE-2024-38513 — Critical (CVSS 10.0): Fiber is an Express-inspired web framework written in Go A vulnerability present in versions prior to 2.52.5 is a…
- CVE-2021-20151 — Critical (CVSS 10.0): Trendnet AC2600 TEW-827DRU version 2.08B01 contains a flaw in the session management for the device. The router's…
- CVE-2025-67446 — Critical (CVSS 9.8): Improper Authentication (Authentication Bypass) exists in Neterbit NW-431F Router 20241014-IR03 and before. The router…
- CVE-2026-25101 — Critical (CVSS 9.8): Bludit allows user's session identifier to be set before authentication. The value of this session ID stays the same…
- CVE-2026-24352 — Critical (CVSS 9.8): PluXml CMS allows a user's session identifier to be set before authentication. The value of this session ID stays the…