CVE-2021-26398: amd 1st gen epyc Out-of-bounds Write
CVSS: 7.8v3.1HighModified
Published 10-01-2023Last modified 09-04-2025
Vulnerability summary
CVE-2021-26398 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in amd 1st gen epyc. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.7% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.21%
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 input validation in SYS_KEY_DERIVE system call in a compromised user application or ABL may allow an attacker to corrupt ASP (AMD Secure Processor) OS memory which may lead to potential arbitrary code execution.
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
0.21%
Chance of exploitation in the next 30 days
Percentile
11%
Versus all other CVEs
30-day change
0.00 pp
From 0.21% on 19-09-2026
19-09-202619-10-2026
EPSS score0.21%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Amd67 products
- 1st gen epycvarious
- 2nd gen epycVarious
- 3rd gen epycvarious
- epyc_7001_firmware< naplespi_1.0.0.h
- epyc_7002_firmware< romepi_1.0.0.c
1 vendor · 67 products