No exploitation reportedFix available

CVE-2021-26334

Q: Is CVE-2021-26334 actively exploited?

Active exploitation of CVE-2021-26334 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-26334?

CVE-2021-26334 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-12-01
Fixed in3.4.502 · 3.4.494
WeaknessCWE-284

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The AMDPowerProfiler.sys driver of AMD μProf tool may allow lower privileged users to access MSRs in kernel which may lead to privilege escalation and ring-0 code execution by the lower privileged user.

Timeline

dates in UTC

2021-12-0116:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-26334?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-26334?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Amd amd uprofversion to verify

Branch	Affected	Fixed in	Source
3.4	< 3.4.502	3.4.502	NVD
3.4	< 3.4.494	3.4.494	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Amd amd uprof to 3.4.502 · 3.4.494

Advisories and patches

www.amd.comMitigation · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.9read 2026-10-23
NVDCVSS 2.09read 2026-10-23
CNAweakness (CWE)CWE-284read 2026-10-23
FIRST EPSSEPSS score1.2 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published: 2021-12-01
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-26334?

Is CVE-2021-26334 actively exploited?

Active exploitation of CVE-2021-26334 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-26334?

CVE-2021-26334 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

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