# CVE-2021-22927: Other in Citrix ADC, Citrix Gateway

> Attackers can hijack sessions in Citrix ADC and Gateway when SAML is configured, leading to account takeover.

- **Severity:** High 8.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 5 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-j95v-2qpj-v897

## What is CVE-2021-22927?

CVE-2021-22927 is a high-severity vulnerability in Citrix ADC, Citrix Gateway, published on 5 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2021-22927?

It affects 3 products.


Products: Citrix Application Delivery Controller Firmware, Citrix Gateway, Citrix Netscaler Gateway.

## How do I fix CVE-2021-22927?

No fix has been published for CVE-2021-22927 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22927 being exploited?

There is no known exploitation of CVE-2021-22927 in the wild and no public exploit code.

## Other vulnerabilities in Citrix ADC, Citrix Gateway

- [CVE-2022-27518](https://insights.sbomify.com/CVE-2022-27518/): Citrix Application Delivery Controller (ADC) and Gateway Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-19781](https://insights.sbomify.com/CVE-2019-19781/): Citrix ADC, Gateway, and SD-WAN WANOP Appliance Code Execution (critical 9.8, exploited in the wild)
- [CVE-2020-8193](https://insights.sbomify.com/CVE-2020-8193/): Citrix ADC, Gateway, and SD-WAN WANOP Appliance Authorization Bypass (medium 6.5, exploited in the wild)
- [CVE-2020-8195](https://insights.sbomify.com/CVE-2020-8195/): Citrix ADC, Gateway, and SD-WAN WANOP Appliance Information Disclosure (medium 6.5, exploited in the wild)
- [CVE-2020-8196](https://insights.sbomify.com/CVE-2020-8196/): Citrix ADC, Gateway, and SD-WAN WANOP Appliance Information Disclosure (medium 4.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22927 and fix it if it is affected.

What it is: CVE-2021-22927 is a high-severity vulnerability in Citrix ADC, Citrix Gateway, published on 5 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-22927 in the wild and no public exploit code.

Affected product: Citrix ADC, Citrix Gateway. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-22927/ (Markdown: https://insights.sbomify.com/CVE-2021-22927/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22927
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22927
- OSV: https://osv.dev/vulnerability/CVE-2021-22927

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22927/
Summaries are generated and may contain mistakes; the official description above is the record.