CVE-2021-28216

FAUCET Score

CVE-2021-28216 describes a high-severity vulnerability in Tianocore EDK II's PEI phase, where the BootPerformanceTable pointer is insecurely read from an NVRAM variable. This local vulnerability (CVSS 7.8) allows an attacker with low privileges to achieve high impact on confidentiality, integrity, and availability. While no public exploit code or active exploitation is reported, its mention in a Lenovo BIOS update article suggests vendor awareness and patching efforts.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		Range not provided by sourceCPE matchmatch criteria	cpe:2.3:a:tianocore:edk_ii:-:::::::*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

1.8

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.42%

Probability of exploitation in next 30 days

EPSS Percentile

34.7%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0042 is in the 75th percentile among its peer group of 17,061 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

microsoft2021-Aug/CVE-2021-28216

BootPerformanceTable pointer is read from an NVRAM variable in PEI. Recommend setting PcdFirmwarePerformanceDataTableS3Support to FALSE.

Aug 10, 2021

References

lists.debian.org / debian-lts-announce/2025/06/msg00007.html

bugzilla.tianocore.org / show_bug.cgi

ExploitIssue TrackingVendor Advisory