Is CVE-2021-26402 in the CISA KEV catalog?

No. CVE-2021-26402 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-26402?

CVE-2021-26402 has a CVSS v3 base score of 7.1 (HIGH).

What is the EPSS score for CVE-2021-26402?

CVE-2021-26402 has an EPSS score of 0.18% (8th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-26402?

Upgrade epyc 7002 firmware to romepi_1.0.0.c or later. Fixes are available for 50 affected products.

CVE & CISA-KEV Catalog

CVE-2021-26402

HIGH

7.1

CVSS v3

NVD

Description

Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of integrity and availability.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

epyc 7002 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7003 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7232p firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7252 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7262 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7272 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7282 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 72f3 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7302 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7302p firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7313 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7313p firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7343 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7352 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7373x firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 73f3 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7402 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7402p firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7413 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7443 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7443p firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7452 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7453 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 74f3 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7502 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7502p firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7513 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7532 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7542 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7543 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7543p firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7552 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7573x firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 75f3 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7642 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7643 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7662 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7663 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7702 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7702p firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7713 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7713p firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7742 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7743 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7763 firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7773x firmwareNVD

Affected:< milanpi_1.0.0.4Fixed in:milanpi_1.0.0.4CVE-2021-26402derived from NVD

epyc 7f32 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7f52 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7f72 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived from NVD

epyc 7h12 firmwareNVD

Affected:< romepi_1.0.0.cFixed in:romepi_1.0.0.cCVE-2021-26402derived 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

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.18%probability of exploitation in 30 days

8thpercentile

Low risk: more likely to be exploited than 8% of all known CVEs.

References

Vendor Advisory1

amd.com

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	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 2025-04-08.