What is CVE-2023-40363?

CVE-2023-40363 is a high-severity vulnerability in IBM Aix, classified under Incorrect Default Permissions. CVSS score: 8.1/10. Published 2023-11-18.

How severe is CVE-2023-40363?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in IBM Aix

CVE-2023-40363

IBM InfoSphere Information Server 11.7 could allow an authenticated user to change installation files due to incorrect file permission settings. IBM X-Force ID: 263332.

Published 2023-11-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.8th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

IBM Aix
IBM Infosphere Information Server — versions 11.7
IBM Infosphere Information Server — versions 11.7
Linux Kernel
Microsoft Windows

Weakness classification (CWE)

CWE-276 — Incorrect Default Permissions

References

www.ibm.com/support/pages/node/7070742 (vendor-advisory, Broken Link)
exchange.xforce.ibmcloud.com/vulnerabilities/263332 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2023-40363?: CVE-2023-40363 is a high-severity vulnerability in IBM Aix, classified under Incorrect Default Permissions. CVSS score: 8.1/10. Published 2023-11-18.
How severe is CVE-2023-40363?: High severity. CVSS v3 base score is 8.1 out of 10.