CVE-2023-31100 — Improper Access Control in SMI handler vulnerability in Phoenix SecureCore™ Tech

Improper Access Control in SMI handler vulnerability in Phoenix SecureCore™ Technology™ 4 allows SPI flash modification. This issue affects SecureCore™ Technology™ 4:

01What is this vulnerability?

Improper Access Control in SMI handler vulnerability in Phoenix SecureCore™ Technology™ 4 allows SPI flash modification. This issue affects SecureCore™ Technology™ 4:

02Affected products

Vendor	Product	Versions
Phoenix	SecureCore™ Technology™ 4	4.3.0.0, 4.3.1.0, 4.4.0.0, 4.5.0.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-11-14T23:17:07.869Z
• Last modified: 2025-07-28T20:48:38.895Z

09References

• phoenixtech.com — https://phoenixtech.com/phoenix-security-notifications/cve-2023-31100/