CVE-2021-26409

HIGHNVD 7.87.8—Trending — 3 sources updated this week

7.8

Insufficient bounds checking in SEV-ES may allow an attacker to corrupt Reverse Map table (RMP) memory, potentially resulting in a loss of SNP (Secure Nested Paging) memory integrity.

CVSS v3: 7.8
EG Score: 7.8(medium)
EPSS: 17.9%
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(1)

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

CWE-120Buffer Copy without Checking Size (Classic Buffer Overflow)

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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.

2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
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-2021-26409?

CVE-2021-26409 is a high vulnerability published on January 11, 2023. Insufficient bounds checking in SEV-ES may allow an attacker to corrupt Reverse Map table (RMP) memory, potentially resulting in a loss of SNP (Secure Nested Paging) memory integrity.

When was CVE-2021-26409 disclosed?

CVE-2021-26409 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-2021-26409 actively exploited?

CVE-2021-26409 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-26409?

CVE-2021-26409 has a CVSS v3 base score of 7.8 (NVD).

How do I remediate CVE-2021-26409?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-26409, 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-2021-26409

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CVE-2021-26409

📅 Published

🔄 Last Modified

🔗 References (2)