5.5

CVE-2021-26407: amd 2nd gen epyc Use of Insufficiently Random Values

CVSS: 5.5v3.1MediumModified
Published 10-01-2023Last modified 08-04-2025
Open JSON

Vulnerability summary

CVE-2021-26407 is a medium (CVSS 5.5) Use of Insufficiently Random Values vulnerability in amd 2nd gen epyc. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.6% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-01-2023
    PublishedVulnerability first disclosed.
  2. 08-04-2025
    Last modifiedVulnerability information updated.

Description

A randomly generated Initialization Vector (IV) may lead to a collision of IVs with the same key potentially resulting in information disclosure.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

0.00 pp

From 0.18% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Amd2 products

1 vendor · 2 products

References

1 links