CVE-2009-3875

CVE-2009-3875 is a medium-severity vulnerability in Sun Jdk with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-310.

Key facts

• Severity: Medium (CVSS 2.0 base score 5.0)
• EPSS exploit prediction: 3% (86th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-310
• Affected product: Sun Jdk
• Published: 2009-11-05
• Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2009-3875?

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.

How severe is CVE-2009-3875?

CVE-2009-3875 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-3875 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3875?

CVE-2009-3875 primarily affects Sun Jdk. In total, 208 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3875?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-3875 published?

CVE-2009-3875 was published on 2009-11-05 and last updated on 2026-06-16.

References

• http://java.sun.com/javase/6/webnotes/6u17.html
• http://lists.apple.com/archives/security-announce/2009/Dec/msg00000.html
• http://lists.apple.com/archives/security-announce/2009/Dec/msg00001.html
• http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00010.html
• http://marc.info/?l=bugtraq&m=126566824131534&w=2
• http://marc.info/?l=bugtraq&m=131593453929393&w=2
• http://marc.info/?l=bugtraq&m=134254866602253&w=2
• http://secunia.com/advisories/37231
• http://secunia.com/advisories/37239
• http://secunia.com/advisories/37386
• http://secunia.com/advisories/37581
• http://secunia.com/advisories/37841
• http://security.gentoo.org/glsa/glsa-200911-02.xml
• http://sunsolve.sun.com/search/document.do?assetkey=1-66-270475-1
• http://support.apple.com/kb/HT3969
• http://support.apple.com/kb/HT3970
• http://www.mandriva.com/security/advisories?name=MDVSA-2010:084
• http://www.oracle.com/technetwork/topics/security/cpujan2010-084891.html
• http://www.redhat.com/support/errata/RHSA-2009-1694.html
• http://www.securityfocus.com/bid/36881
• http://www.vupen.com/english/advisories/2009/3131
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11847
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12112
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7549
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7913

Affected products (208)

• cpe:2.3:a:sun:jdk:1.5.0:update1:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update10:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update11:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update11_b03:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update12:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update13:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update14:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update15:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update16:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update17:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update18:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update19:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update2:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update20:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update21:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update3:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update4:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update5:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update6:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update7:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update7_b03:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update8:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.5.0:update9:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update1:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update10:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update11:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update12:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update13:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update14:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update15:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update16:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update2:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update3:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update4:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update5:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update6:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update7:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update8:*:*:*:*:*:*
• cpe:2.3:a:sun:jdk:1.6.0:update9:*:*:*:*:*:*
• cpe:2.3:a:sun:jre:1.4.2_1:*:*:*:*:*:*:*

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