What is CVE-2023-27555?

CVE-2023-27555 is a medium-severity vulnerability in IBM Db2, classified under Improper Input Validation. CVSS score: 5.1/10. Published 2023-04-28.

How severe is CVE-2023-27555?

Medium severity. CVSS v3 base score is 5.1 out of 10.

Improper input validation in IBM Db2

CVE-2023-27555

IBM Db2 for Linux, UNIX and Windows (includes DB2 Connect Server) 11.5 is vulnerable to a denial of service when attempting to use ACR client affinity for unfenced DRDA federation wrappers. IBM X-Force ID: 249187.

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

Published 2023-04-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.8th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% 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 Db2 — versions 10.5, 11.1.4
IBM Db2 For Linux, Unix And Windows — versions 11.5
Linux Kernel
Microsoft Windows

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.ibm.com/support/pages/node/6985683 (vendor-advisory, Patch, Vendor Advisory)
exchange.xforce.ibmcloud.com/vulnerabilities/249187 (VDB Entry, vdb-entry, Vendor Advisory)
security.netapp.com/advisory/ntap-20230511-0010/

Frequently asked questions

What is CVE-2023-27555?: CVE-2023-27555 is a medium-severity vulnerability in IBM Db2, classified under Improper Input Validation. CVSS score: 5.1/10. Published 2023-04-28.
How severe is CVE-2023-27555?: Medium severity. CVSS v3 base score is 5.1 out of 10.