CVE-2009-3875: Sun JDK

Medium severity, CVSS 5.0. EPSS: 3.2% chance of exploitation in the next 30 days.

The MessageDigest.isEqual function in Java Runtime Environment (JRE) in Sun Java SE in JDK and JRE 5.0 before Update 22, JDK and JRE 6 before Update 17, SDK and JRE 1.3.x before 1.3.1_27, and SDK and JRE 1.4.x before 1.4.2_24 allows remote attackers to spoof HMAC-based digital signatures, and possibly bypass authentication, via unspecified vectors related to "timing attack vulnerabilities," aka Bug Id 6863503.

Affected products

• Sun JDK: version 1.5.0 only; version 1.6.0 only
• Sun JRE: version 1.4.2_1 only; version 1.4.2_2 only; version 1.4.2_02 only; version 1.4.2_03 only; version 1.4.2_3 only; version 1.4.2_4 only; …
• Sun SDK: version 1.4.2_01 only; version 1.4.2_1 only; version 1.4.2_2 only; version 1.4.2_02 only; version 1.4.2_03 only; version 1.4.2_3 only; …

Published 2009-11-05. Last modified 2026-06-16.