# CVE-2022-35408: Privilege escalation in n/a

> An SMM callout vulnerability in InsydeH2O firmware allows attackers to overwrite function pointers, leading to arbitrary code execution and privilege escalation in 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:** 22 Sep 2022
- **Updated:** 27 May 2025
- **Also known as:** GHSA-49c7-gf66-cc93

## What is CVE-2022-35408?

CVE-2022-35408 is a high-severity vulnerability in Insyde Insydeh2o, published on 22 Sep 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 Insyde InsydeH2O with kernel 5.0 through 5.5. An SMM callout vulnerability in the SMM driver in UsbLegacyControlSmm leads to possible arbitrary code execution in SMM and escalation of privileges. An attacker could overwrite the function pointers in the EFI_BOOT_SERVICES table before the USB SMI handler triggers. (This is not exploitable from code running in the operating system.)

Weakness: CWE-123 (Write-what-where Condition)

## Which versions are affected by CVE-2022-35408?

It affects 1 product.


Products: Insyde Insydeh2o.

## How do I fix CVE-2022-35408?

No fix has been published for CVE-2022-35408 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-35408 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-35408 exists.

## 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-2022-35408 and fix it if it is affected.

What it is: CVE-2022-35408 is a high-severity vulnerability in Insyde Insydeh2o, published on 22 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-35408 exists.

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-2022-35408/ (Markdown: https://insights.sbomify.com/CVE-2022-35408/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-35408
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-35408
- OSV: https://osv.dev/vulnerability/CVE-2022-35408

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-35408/
Summaries are generated and may contain mistakes; the official description above is the record.