# CVE-2021-39295: Denial of service in n/a

> Attackers can cause a denial of service on OpenBMC systems by sending crafted IPMI messages via the netipmid interface.

- **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:** 15 Apr 2023
- **Updated:** 6 Feb 2025
- **Also known as:** GHSA-8gg3-qvw7-qmgm

## What is CVE-2021-39295?

CVE-2021-39295 is a high-severity denial of service vulnerability in n/a, published on 15 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In OpenBMC 2.9, crafted IPMI messages allow an attacker to cause a denial of service to the BMC via the netipmid (IPMI lan+) interface.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2021-39295?

It affects 1 product.


Products: Openbmc-Project Openbmc.

## How do I fix CVE-2021-39295?

No fix has been published for CVE-2021-39295 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-39295 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-39295 exists.

## Other vulnerabilities in n/a

- [CVE-2021-39296](https://insights.sbomify.com/CVE-2021-39296/): Auth bypass in n/a (critical 10.0)
- [CVE-2020-14156](https://insights.sbomify.com/CVE-2020-14156/): Misconfiguration in n/a (high 8.8)
- [CVE-2022-2809](https://insights.sbomify.com/CVE-2022-2809/): Unauthenticated out of bounds heap write in bmcweb (high 8.2)
- [CVE-2022-3409](https://insights.sbomify.com/CVE-2022-3409/): Unauthenticated out of bounds stack write in bmcweb (high 8.2)
- [CVE-2022-35729](https://insights.sbomify.com/CVE-2022-35729/): Denial of service in OpenBMC (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-39295 and fix it if it is affected.

What it is: CVE-2021-39295 is a high-severity denial of service vulnerability in n/a, published on 15 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-39295 exists.

Affected product: n/a. 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-2021-39295/ (Markdown: https://insights.sbomify.com/CVE-2021-39295/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-39295
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-39295
- OSV: https://osv.dev/vulnerability/CVE-2021-39295

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-39295/
Summaries are generated and may contain mistakes; the official description above is the record.