CVE-2021-26409: amd 3rd gen epyc Classic Buffer Overflow
CVSS: 7.8v3.1HighModified
Published 10-01-2023Last modified 09-04-2025
Vulnerability summary
CVE-2021-26409 is a high (CVSS 7.8) Classic Buffer Overflow vulnerability in amd 3rd gen epyc. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 10-01-2023PublishedVulnerability first disclosed.
- 09-04-2025Last modifiedVulnerability information updated.
Description
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 metrics
2 scores · 2 sources · 1 versionHigh 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesAll 2 agree
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.19%
Chance of exploitation in the next 30 days
Percentile
8%
Versus all other CVEs
30-day change
0.00 pp
From 0.19% on 19-09-2026
19-09-202619-10-2026
EPSS score0.19%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Amd2 products
- 3rd gen epycvarious
- milanpi_firmware< 1.0.0.3
1 vendor · 2 products