CVE-2009-3875

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

3.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2009-11-05 16:30 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-16 23:12 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 3.2% in the next 30 days (EPSS).
• Severity: 5.0 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2009-11-05 16:30 UTC

Last modified

2026-06-16 23:12 UTC

Exploit probability

3.2% · EPSS, next 30 days

Weakness

CWE-310

Record status

Modified

Affected

• Sun Jdk 1.5.0
• Sun Jdk 1.6.0
• Sun Jre 1.4.2_1
• Sun Jre 1.4.2_2
• Sun Jre 1.4.2_02
• Sun Jre 1.4.2_03
• Sun Jre 1.4.2_3
• Sun Jre 1.4.2_4

Attack profile CVSS 2.0 · 5.0

Attack vector

Network

Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2009-3875.md and follow it. Check whether this project is affected by CVE-2009-3875. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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