CVE-2023-27555: IBM Db2 denial of service

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-04-28 · updated 2026-06-17
Weakness: CWE-20

Description

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.

Affected products

IBM Db2 for Linux, UNIX and Windows: from 11.1 before 11.1.4; from 11.5 before 11.5.8; 10.5, 10.5-fp1, 10.5-fp10, 10.5-fp2, 10.5-fp3, 10.5-fp3a (+13) — fixed in 11.1.4, 11.5.8

How to fix

Upgrade to a fixed version: IBM Db2 for Linux, UNIX and Windows 11.1.4, 11.5.8. Check the vendor advisory for mitigations.

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/249187
https://security.netapp.com/advisory/ntap-20230511-0010/
https://www.ibm.com/support/pages/node/6985683
https://exchange.xforce.ibmcloud.com/vulnerabilities/249187
https://security.netapp.com/advisory/ntap-20230511-0010/
https://www.ibm.com/support/pages/node/6985683

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