CVE-2020-4355: IBM DB2

Medium severity, CVSS 5.3. EPSS: 2.2% chance of exploitation in the next 30 days.

IBM DB2 for Linux, UNIX and Windows (includes DB2 Connect Server) 9.7, 10.1, 10.5, 11.1, and 11.5 is vulnerable to a denial of service, caused by improper handling of Secure Sockets Layer (SSL) renegotiation requests. By sending specially-crafted requests, a remote attacker could exploit this vulnerability to increase the resource usage on the system. IBM X-Force ID: 178507.

Affected products

• IBM DB2: version 9.7.0.0 only; version 10.1.0.0 only; version 10.5.0.0 only; version 11.1.0.0 only; version 11.5.0.0 only

Published 2020-07-01. Last modified 2026-06-17.