How severe is CVE-2023-31100?

CVE-2023-31100 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2023-31100 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-31100?

CVE-2023-31100 affects Phoenixtech Securecore Technology. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-31100?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-31100 published?

CVE-2023-31100 was published on 2023-11-15 and last updated on 2026-06-17.

CVE-2023-31100

CVE-2023-31100 is a high-severity vulnerability in Phoenixtech Securecore Technology with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Phoenixtech Securecore Technology
Published: 2023-11-15
Last modified: 2026-06-17

Description

Improper Access Control in SMI handler vulnerability in Phoenix SecureCore™ Technology™ 4 allows SPI flash modification. This issue affects SecureCore™ Technology™ 4: * from 4.3.0.0 before 4.3.0.203 * from 4.3.1.0 before 4.3.1.163 * from 4.4.0.0 before 4.4.0.217 * from 4.5.0.0 before 4.5.0.138

Frequently asked questions

What is CVE-2023-31100?: Improper Access Control in SMI handler vulnerability in Phoenix SecureCore™ Technology™ 4 allows SPI flash modification. This issue affects SecureCore™ Technology™ 4: * from 4.3.0.0 before 4.3.0.203 * from 4.3.1.0 before 4.3.1.163 * from 4.4.0.0 before 4.4.0.217 * from 4.5.0.0 before 4.5.0.138
How severe is CVE-2023-31100?: CVE-2023-31100 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2023-31100 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-31100?: CVE-2023-31100 affects Phoenixtech Securecore Technology. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-31100?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-31100 published?: CVE-2023-31100 was published on 2023-11-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:phoenixtech:securecore_technology:*:*:*:*:*:*:*:*

More vulnerabilities in Phoenixtech Securecore Technology

CVE-2023-5058 — High (CVSS 7.8): Improper Input Validation in the processing of user-supplied splash screen during system boot in Phoenix SecureCore™…
CVE-2024-1598 — High (CVSS 7.5): Potential buffer overflow in unsafe UEFI variable handling in Phoenix SecureCore™ for Intel Gemini Lake.This issue…
CVE-2024-0762 — High (CVSS 7.5): Potential buffer overflow in unsafe UEFI variable handling in Phoenix SecureCore™ for select Intel…
CVE-2024-12533 — Low (CVSS 3.3): Improper Check for Unusual or Exceptional Conditions vulnerability in Phoenix SecureCore Technology 4 allows Input Data…
CVE-2024-29980 — Low (CVSS 2.3): Improper Check for Unusual or Exceptional Conditions vulnerability in Phoenix SecureCore™ for Intel Kaby Lake,…
CVE-2024-29979 — Low (CVSS 2.3): Improper Check for Unusual or Exceptional Conditions vulnerability in Phoenix SecureCore™ for Intel Kaby Lake,…

All CVEs affecting Phoenixtech Securecore Technology →

Other CWE-284 (Improper Access Control) vulnerabilities

CVE-2026-50746 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi…
CVE-2026-46978 — Critical (CVSS 10.0): Vulnerability in the Oracle Solaris product of Oracle Systems (component: Remote Administration Daemon). The…
CVE-2026-35308 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Centralized Third Party Jars).…
CVE-2026-35307 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that…
CVE-2026-46695 — Critical (CVSS 10.0): Boxlite is a sandbox service that allows users to create lightweight virtual machines (Boxes) and launch OCI containers…
CVE-2026-46840 — Critical (CVSS 10.0): Vulnerability in Oracle REST Data Services (component: Backend-as-a-Service). Supported versions that are affected are…

Browse all CWE-284 (Improper Access Control) vulnerabilities →