6.7

CVE-2025-52536: amd64-microcode

CVSS: 6.7v4.0MediumDeferred
AliasesUBUNTU-CVE-2025-52536DEBIAN-CVE-2025-52536
Published 10-02-2026Last modified 10-02-2026
Open JSON

Vulnerability summary

CVE-2025-52536 is a medium (CVSS 6.7) vulnerability in amd64-microcode. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.4% of scored vulnerabilities.

Overall risk
27/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.7/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.16%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-02-2026
    PublishedVulnerability first disclosed.
  2. 10-02-2026
    Last modifiedVulnerability information updated.

Description

Improper Prevention of Lock Bit Modification in SEV firmware could allow a privileged attacker to downgrade firmware potentially resulting in a loss of integrity.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

+0.02 pp

From 0.14% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.16%

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

Debian1 product
  • amd64-microcodeAll versions (No fix recorded)
Ubuntu1 product
  • amd64-microcodeAll versions (No fix recorded)

2 vendors · 2 products

References

4 links