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Vulnerability record · CVE-2026-20716 · published 11 August 2026

CVE-2026-20716: Intel xeon 634 firmware improper access control vulnerability

Intel · Xeon 634 Firmware

Improper access control for some Intel(R) Processors within Ring 3: User Applications may allow an escalation of privilege. Simple hardware adversary with an authenticated user combined with a high complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present with special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

7.2 CVSS 4.0 High EPSS 0.09% · top 99.6% CWE-284 · Improper access control
7.2CVSS 4.0 base score
0.09%EPSS exploitation probability, 30 days
NoNot in CISA KEV
90Affected product versions listed by NVD
1References
31 Aug 2026Last modified by NVD

Description

Improper access control for some Intel(R) Processors within Ring 3: User Applications may allow an escalation of privilege. Simple hardware adversary with an authenticated user combined with a high complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present with special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (high), integrity (high) and availability (none) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

90 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01435.html Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-20716), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.