# CVE-2020-4376: Denial of service in MQ for HPE NonStop

> An attacker can cause a denial of service in IBM MQ due to an error in the pubsub logic, affecting system availability.

- **Severity:** Medium 5.3 (`CVSS:3.0/AC:H/A:H/PR:L/UI:N/C:N/S:U/AV:N/I:N/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:** 1 Jul 2020
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-px4f-6m2q-8v75

## What is CVE-2020-4376?

CVE-2020-4376 is a medium-severity denial of service vulnerability in IBM MQ for HPE NonStop, published on 1 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IBM MQ, IBM MQ Appliance, IBM MQ for HPE NonStop 8.0.4 and 8.1.0 could allow an attacker to cause a denial of service caused by an error within the pubsub logic. IBM X-Force ID: 179081.

## Which versions are affected by CVE-2020-4376?

It affects 1 product.


Products: Ibm Mq for Hpe Nonstop.

## How do I fix CVE-2020-4376?

No fix has been published for CVE-2020-4376 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-4376 being exploited?

There is no known exploitation of CVE-2020-4376 in the wild and no public exploit code.

## Other vulnerabilities in IBM MQ for HPE NonStop

- [CVE-2021-38950](https://insights.sbomify.com/CVE-2021-38950/): Privilege escalation in MQ for HPE NonStop (high 7.4)
- [CVE-2022-40237](https://insights.sbomify.com/CVE-2022-40237/): IBM MQ for HPE NonStop denial of service (medium 6.5)
- [CVE-2020-4466](https://insights.sbomify.com/CVE-2020-4466/): Denial of service in MQ for HPE NonStop (medium 6.5)
- [CVE-2022-22325](https://insights.sbomify.com/CVE-2022-22325/): Information disclosure in MQ for HPE NonStop (medium 5.1)
- [CVE-2020-4352](https://insights.sbomify.com/CVE-2020-4352/): Privilege escalation in MQ for HPE NonStop (medium 4.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-4376 and fix it if it is affected.

What it is: CVE-2020-4376 is a medium-severity denial of service vulnerability in IBM MQ for HPE NonStop, published on 1 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-2020-4376 in the wild and no public exploit code.

Affected product: IBM MQ for HPE NonStop. 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-2020-4376/ (Markdown: https://insights.sbomify.com/CVE-2020-4376/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-4376
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-4376
- OSV: https://osv.dev/vulnerability/CVE-2020-4376

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-4376/
Summaries are generated and may contain mistakes; the official description above is the record.