CVE-2021-26355

MEDIUMNVD 5.55.5—

5.5

Insufficient fencing and checks in System Management Unit (SMU) may result in access to invalid message port registers that could result in a potential denial-of-service.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 16.9%
KEV: Not listed

Published

January 11, 2023

Last Modified

April 9, 2025

References (2)

psirt@amdhttps://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032
af854a3a-2127-422b-91ae-364da2661108https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 08:53 UTCEG score recompute
2026-05-25 08:53 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-26355?

CVE-2021-26355 is a medium vulnerability published on January 11, 2023. Insufficient fencing and checks in System Management Unit (SMU) may result in access to invalid message port registers that could result in a potential denial-of-service.

When was CVE-2021-26355 disclosed?

CVE-2021-26355 was first published in the National Vulnerability Database on January 11, 2023, with the most recent update on April 9, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-26355 actively exploited?

CVE-2021-26355 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-26355?

CVE-2021-26355 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-26355?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-26355, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-26355

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CVE-2021-26355

📅 Published

🔄 Last Modified

🔗 References (2)