What is CVE-2023-30991?

CVE-2023-30991 is a high-severity vulnerability in IBM Db2, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2023-10-16.

How severe is CVE-2023-30991?

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

Improper input validation in IBM Db2

CVE-2023-30991

IBM Db2 for Linux, UNIX and Windows (includes Db2 Connect Server) 11.1 and 11.5 is vulnerable to denial of service with a specially crafted query. IBM X-Force ID: 254037.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2023-10-16 · 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: 0.010 (62.8th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.010 · change: +0.002

Affected products

IBM Db2 — versions 11.1.4
IBM Db2 For Linux, Unix And Windows — versions 11.1, 11.5
Linux Kernel
Microsoft Windows
Opengroup Unix

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.ibm.com/support/pages/node/7047499 (vendor-advisory, Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/254037 (VDB Entry, vdb-entry, Vendor Advisory)
security.netapp.com/advisory/ntap-20231116-0005/ (Third Party Advisory)

Frequently asked questions

What is CVE-2023-30991?: CVE-2023-30991 is a high-severity vulnerability in IBM Db2, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2023-10-16.
How severe is CVE-2023-30991?: High severity. CVSS v3 base score is 7.5 out of 10.