# CVE-2020-8246: Denial of service in Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP

> Attackers on the management network can cause a denial of service in Citrix ADC and Gateway products.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Sep 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-5wpp-rjjg-p4xh

## What is CVE-2020-8246?

CVE-2020-8246 is a high-severity denial of service vulnerability in Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP, published on 18 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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 ADC 12.1-FIPS before 12.1-55.187, Citrix ADC and NetScaler Gateway 12.0, Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.12, Citrix SD-WAN WANOP 11.2 before 11.2.1a, Citrix SD-WAN WANOP 11.1 before 11.1.2a, Citrix SD-WAN WANOP 11.0 before 11.0.3f, Citrix SD-WAN WANOP 10.2 before 10.2.7b are vulnerable to a denial of service attack originating from the management network.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2020-8246?

It affects 4 products.


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

## How do I fix CVE-2020-8246?

No fix has been published for CVE-2020-8246 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-8246 being exploited?

There is no known exploitation of CVE-2020-8246 in the wild and no public exploit code.

## 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-2020-8246 and fix it if it is affected.

What it is: CVE-2020-8246 is a high-severity denial of service vulnerability in Citrix ADC, Citrix Gateway, Citrix SDWAN WAN-OP, published on 18 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-8246 in the wild and no public exploit code.

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-2020-8246/ (Markdown: https://insights.sbomify.com/CVE-2020-8246/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-8246
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-8246
- OSV: https://osv.dev/vulnerability/CVE-2020-8246

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-8246/
Summaries are generated and may contain mistakes; the official description above is the record.