What is CVE-2020-4135?

CVE-2020-4135 is a high-severity vulnerability in IBM Aix. CVSS score: 7.5/10. Published 2020-02-19.

How severe is CVE-2020-4135?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in IBM Aix

CVE-2020-4135

IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) 9.7, 10.1, 10.5, 11.1, and 11.5 could allow an unauthenticated user to send specially crafted packets to cause a denial of service from excessive memory usage.

Published 2020-02-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

IBM Aix
IBM Db2 — versions 9.7, 10.1, 10.5
IBM Db2 For Linux- Unix And Windows — versions 9.7, 10.1, 10.5
Linux Kernel
Microsoft Windows
NetApp Oncommand Insight

References

www.ibm.com/support/pages/node/2876307 (Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/173806 (VDB Entry, vdb-entry, Vendor Advisory)
security.netapp.com/advisory/ntap-20210108-0001/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-4135?: CVE-2020-4135 is a high-severity vulnerability in IBM Aix. CVSS score: 7.5/10. Published 2020-02-19.
How severe is CVE-2020-4135?: High severity. CVSS v3 base score is 7.5 out of 10.