Is CVE-2021-26403 in the CISA KEV catalog?

No. CVE-2021-26403 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26403?

CVE-2021-26403 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-26403?

CVE-2021-26403 has an EPSS score of 0.12% (2th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26403?

Upgrade epyc 7001 firmware to naplespi_1.0.0.e or later. Fixes are available for 41 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26403

MEDIUM

6.5

CVSS v3

NVD

Description

Insufficient checks in SEV may lead to a malicious hypervisor disclosing the launch secret potentially resulting in compromise of VM confidentiality.

CWE-345

How to fix

Remediation Available

epyc 7001 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7002 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7232p firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7251 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7252 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7261 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7262 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7272 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7281 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7282 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7301 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7302 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7302p firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7351 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7351p firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7352 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7371 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7401 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7401p firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7402 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7402p firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7451 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7452 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7501 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7502 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7502p firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7532 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7542 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7551 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7551p firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7552 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7601 firmwareNVD

Affected:< naplespi_1.0.0.eFixed in:naplespi_1.0.0.eCVE-2021-26403derived from NVD

epyc 7642 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7662 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7702 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7702p firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7742 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7f32 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7f52 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7f72 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived from NVD

epyc 7h12 firmwareNVD

Affected:< romepi_1.0.0.9Fixed in:romepi_1.0.0.9CVE-2021-26403derived 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

ScopeChanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.12%probability of exploitation in 30 days

2ndpercentile

Low risk: more likely to be exploited than 2% of all known CVEs.

References

Vendor Advisory1

amd.com

Related Vulnerabilities

Other CWE-345 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-38831	High	7.8	98%	KEV + Ransom	Fix
CVE-2016-4553	High	8.6	80%	-	Fix
CVE-2016-4554	High	8.6	39%	-	Fix
CVE-2023-35719	Medium	6.8	26%	-	-
CVE-2022-26871	Critical	9.8	20%	KEV	-
CVE-2014-4936	High	9.3	17%	-	-

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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 2025-04-08.