What is CVE-2020-4887?

CVE-2020-4887 is a medium-severity vulnerability in IBM Aix. CVSS score: 5.5/10. Published 2021-01-20.

How severe is CVE-2020-4887?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in IBM Aix

CVE-2020-4887

IBM AIX 7.1, 7.2 and AIX VIOS 3.1 could allow a local user to exploit a vulnerability in the gencore user command to create arbitrary files in any directory. IBM X-Force ID: 190911.

Published 2021-01-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (21.0th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

IBM Aix — versions 7.1, 7.2
IBM Vios — versions 3.1

References

www.ibm.com/support/pages/node/6406022 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/190911 (VDB Entry, vdb-entry, Vendor Advisory)

Frequently asked questions

What is CVE-2020-4887?: CVE-2020-4887 is a medium-severity vulnerability in IBM Aix. CVSS score: 5.5/10. Published 2021-01-20.
How severe is CVE-2020-4887?: Medium severity. CVSS v3 base score is 5.5 out of 10.