Is CVE-2021-26391 in the CISA KEV catalog?

No. CVE-2021-26391 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26391?

CVE-2021-26391 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-26391?

CVE-2021-26391 has an EPSS score of 0.17% (7th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26391?

Upgrade enterprise driver to 22.10.20 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26391

HIGH

7.8

CVSS v3

NVD

Description

Insufficient verification of multiple header signatures while loading a Trusted Application (TA) may allow an attacker with privileges to gain code execution in that TA or the OS/kernel.

CWE-347

How to fix

Remediation Available

enterprise driverNVD

Affected:< 22.10.20Fixed in:22.10.20CVE-2021-26391derived from NVD

radeon pro softwareNVD

Affected:< 22.q2Fixed in:22.q2CVE-2021-26391derived from NVD

radeon softwareNVD

Affected:< 22.5.2Fixed in:22.5.2CVE-2021-26391derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.17%probability of exploitation in 30 days

7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Vendor Advisory1

amd.com

Related Vulnerabilities

Other CWE-347 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-16042	Medium	6.5	82%	-	-
CVE-2025-59718	Critical	9.8	66%	KEV	Fix
CVE-2025-25292	Critical	9.8	64%	-	Fix
CVE-2021-22160	Critical	9.8	53%	-	Fix
CVE-2013-3900	Medium	5.5	45%	KEV	-
CVE-2018-0114	High	7.5	43%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-05-01.