# CVE-2020-4399: Denial of service in Verify Gateway (IVG)

> An authenticated user can cause a denial of service against the IBM Verify Gateway server by sending malformed requests.

- **Severity:** Medium 6.5 (`CVSS:3.0/A:H/AV:N/PR:L/C:N/I:N/S:U/UI:N/AC:L/RL:O/RC:C/E:U`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Jul 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-4pc7-f2vc-2rv4

## What is CVE-2020-4399?

CVE-2020-4399 is a medium-severity denial of service vulnerability in IBM Verify Gateway (IVG), published on 22 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IBM Verify Gateway (IVG) 1.0.0 and 1.0.1 could allow an authenticated user to send malformed requests to cause a denial of service against the server. IBM X-Force ID: 179476.

## Which versions are affected by CVE-2020-4399?

It affects 1 product.


Products: Ibm Verify Gateway.

## How do I fix CVE-2020-4399?

No fix has been published for CVE-2020-4399 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-4399 being exploited?

There is no known exploitation of CVE-2020-4399 in the wild and no public exploit code.

## Other vulnerabilities in IBM Verify Gateway (IVG)

- [CVE-2020-4400](https://insights.sbomify.com/CVE-2020-4400/): Security feature bypass in Verify Gateway (IVG) (high 7.5)
- [CVE-2020-4385](https://insights.sbomify.com/CVE-2020-4385/): Hardcoded credentials in Verify Gateway (IVG) (medium 6.8)
- [CVE-2020-4397](https://insights.sbomify.com/CVE-2020-4397/): Information disclosure in Verify Gateway (IVG) (medium 6.8)
- [CVE-2020-4372](https://insights.sbomify.com/CVE-2020-4372/): Hardcoded credentials in Verify Gateway (IVG) (medium 6.2)
- [CVE-2020-4369](https://insights.sbomify.com/CVE-2020-4369/): Information disclosure in Verify Gateway (IVG) (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-4399 and fix it if it is affected.

What it is: CVE-2020-4399 is a medium-severity denial of service vulnerability in IBM Verify Gateway (IVG), published on 22 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-4399 in the wild and no public exploit code.

Affected product: IBM Verify Gateway (IVG). 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-2020-4399/ (Markdown: https://insights.sbomify.com/CVE-2020-4399/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-4399
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4399
- OSV: https://osv.dev/vulnerability/CVE-2020-4399

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-4399/
Summaries are generated and may contain mistakes; the official description above is the record.