# CVE-2020-8191: Cross-site scripting in Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP

> Reflected Cross-Site Scripting in Citrix ADC and Gateway allows attackers to execute scripts in user sessions, requiring an upgrade to secure versions.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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:** 10 Jul 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-h686-q2xf-663f

## What is CVE-2020-8191?

CVE-2020-8191 is a medium-severity cross-site scripting vulnerability in Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP, published on 10 Jul 2020. 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

Improper input validation in Citrix ADC and Citrix Gateway versions before 13.0-58.30, 12.1-57.18, 12.0-63.21, 11.1-64.14 and 10.5-70.18 and Citrix SDWAN WAN-OP versions before 11.1.1a, 11.0.3d and 10.2.7 allows reflected Cross Site Scripting (XSS).

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2020-8191?

It affects 4 products.


Products: Citrix Application Delivery Controller Firmware, Citrix Gateway Firmware, Citrix Netscaler Gateway Firmware, Citrix Sd-Wan Wanop.

## How do I fix CVE-2020-8191?

No fix has been published for CVE-2020-8191 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-8191 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-8191 exists.

Public exploit code:

- Citrix ADC/Gateway - Cross-Site Scripting (nuclei): http/cves/2020/CVE-2020-8191.yaml

## Other vulnerabilities in Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP

- [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-2020-8191 and fix it if it is affected.

What it is: CVE-2020-8191 is a medium-severity cross-site scripting vulnerability in Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP, published on 10 Jul 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-8191 exists.

Affected product: Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP. 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-2020-8191/ (Markdown: https://insights.sbomify.com/CVE-2020-8191/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8191
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8191
- OSV: https://osv.dev/vulnerability/CVE-2020-8191

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-8191/
Summaries are generated and may contain mistakes; the official description above is the record.