# CVE-2021-42113: Privilege escalation in n/a

> An SMM callout vulnerability in InsydeH2O firmware allows attackers to hijack execution flow and escalate privileges to System Management Mode.

- **Severity:** High 8.2 (`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Feb 2022
- **Updated:** 11 Aug 2026
- **Also known as:** GHSA-h4c9-5784-r394

## What is CVE-2021-42113?

CVE-2021-42113 is a high-severity vulnerability in Insyde Insydeh2o, published on 3 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An issue was discovered in StorageSecurityCommandDxe in Insyde InsydeH2O with Kernel 5.1 before 05.14.28, Kernel 5.2 before 05.24.28, and Kernel 5.3 before 05.32.25. An SMM callout vulnerability allows an attacker to hijack execution flow of code running in System Management Mode. Exploiting this issue could lead to escalating privileges to SMM.

## Which versions are affected by CVE-2021-42113?

It affects 1 product.


Products: Insyde Insydeh2o.

## How do I fix CVE-2021-42113?

No fix has been published for CVE-2021-42113 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42113 being exploited?

There is no known exploitation of CVE-2021-42113 in the wild and no public exploit code.

## Other vulnerabilities in Insyde Insydeh2o

- [CVE-2021-41842](https://insights.sbomify.com/CVE-2021-41842/): Missing authorization in n/a (critical 9.8)
- [CVE-2023-22612](https://insights.sbomify.com/CVE-2023-22612/): Memory corruption in n/a (high 8.8)
- [CVE-2023-22613](https://insights.sbomify.com/CVE-2023-22613/): Memory corruption in n/a (high 8.8)
- [CVE-2023-22614](https://insights.sbomify.com/CVE-2023-22614/): Memory corruption in n/a (high 8.8)
- [CVE-2023-22615](https://insights.sbomify.com/CVE-2023-22615/): Memory corruption in n/a (high 8.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42113 and fix it if it is affected.

What it is: CVE-2021-42113 is a high-severity vulnerability in Insyde Insydeh2o, published on 3 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-42113 in the wild and no public exploit code.

Affected product: Insyde Insydeh2o. 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-2021-42113/ (Markdown: https://insights.sbomify.com/CVE-2021-42113/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42113
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42113
- OSV: https://osv.dev/vulnerability/CVE-2021-42113

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42113/
Summaries are generated and may contain mistakes; the official description above is the record.