What is CVE-2025-36251?

CVE-2025-36251 is a critical-severity vulnerability in IBM Aix, classified under Process Control. CVSS score: 9.6/10. Published 2025-11-13.

How severe is CVE-2025-36251?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Vulnerability in IBM Aix

CVE-2025-36251

IBM AIX 7.2, and 7.3 and IBM VIOS 3.1, and 4.1 nimsh service SSL/TLS implementations could allow a remote attacker to execute arbitrary commands due to improper process controls. This addresses additional attack vectors for a vulnerability that was previously addressed in CVE-2024-56347.

Published 2025-11-13 · last modified 2026-10-18.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.005 (44.4th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

IBM Aix — versions 7.2, 7.3
IBM Vios — versions 4.1.0, 3.1.0, 3.1

Weakness classification (CWE)

CWE-114 — Process Control

References

www.ibm.com/support/pages/node/7251173 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-36251?: CVE-2025-36251 is a critical-severity vulnerability in IBM Aix, classified under Process Control. CVSS score: 9.6/10. Published 2025-11-13.
How severe is CVE-2025-36251?: Critical severity. CVSS v3 base score is 9.6 out of 10.