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Fencer Vulns
critical 9.3

CVE-2009-3866 json

The Java Web Start Installer in Sun Java SE in JDK and JRE 6 before Update 17 does not properly use security model permissions when removin…

published 2009-11-05 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3837

cvss
9.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.2%
EPSS 6.2% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

The Java Web Start Installer in Sun Java SE in JDK and JRE 6 before Update 17 does not properly use security model permissions when removing installer extensions, which allows remote attackers to execute arbitrary code by modifying a certain JNLP file to have a URL field that points to an unintended trusted application, aka Bug Id 6872824.

Patch / fix

  • java-1.6.0-ibm RHEL 4 EXTRAS, network satellite 5.3 1:1.6.0.7-1jpp.3.el4
  • java-1.6.0-ibm RHEL 5 EXTRAS, network satellite 5.3 1:1.6.0.7-1jpp.2.el5
  • java-1.6.0-sun RHEL 4 EXTRAS 1:1.6.0.17-1jpp.1.el4
  • java-1.6.0-sun RHEL 5 EXTRAS 1:1.6.0.17-1jpp.2.el5
  • java-1.6.0-sun-src RHEL 4 EXTRAS 1:1.6.0.17-1jpp.1.el4
  • java-1.6.0-sun-src RHEL 5 EXTRAS 1:1.6.0.17-1jpp.2.el5
  • java-1.6.0-sun-demo RHEL 4 EXTRAS 1:1.6.0.17-1jpp.1.el4
  • java-1.6.0-sun-demo RHEL 5 EXTRAS 1:1.6.0.17-1jpp.2.el5

red hat advisories RHSA-2010:0043RHSA-2009:1560RHSA-2009:1694

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2009-3866 updated cvss 6.8

java-1.6.0-sun: Privilege escalation in the Java Web Start Installer (6872824)

  • Red Hat Desktop version 4 Extras java-1.6.0-ibm 1.6.0.7-1jpp.3.el4, java-1.6.0-sun 1.6.0.17-1jpp.1.el4, java-1.6.0-ibm-src 1.6.0.7-1jpp.3.el4, java-1.6.0-ibm-demo 1.6.0.7-1jpp.3.el4, java-1.6.0-ibm-jdbc 1.6.0.7-1jpp.3.el4, java-1.6.0-sun-src 1.6.0.17-1jpp.1.el4, +5 more Red Hat Enterprise Linux AS version 4 Extras java-1.6.0-ibm 1.6.0.7-1jpp.3.el4, java-1.6.0-sun 1.6.0.17-1jpp.1.el4, java-1.6.0-ibm-src 1.6.0.7-1jpp.3.el4, java-1.6.0-ibm-demo 1.6.0.7-1jpp.3.el4, java-1.6.0-ibm-jdbc 1.6.0.7-1jpp.3.el4, java-1.6.0-sun-src 1.6.0.17-1jpp.1.el4, +5 more Red Hat Enterprise Linux Desktop Supplementary (v. 5) java-1.6.0-ibm 1.6.0.7-1jpp.2.el5, java-1.6.0-sun 1.6.0.17-1jpp.2.el5, java-1.6.0-ibm-src 1.6.0.7-1jpp.2.el5, java-1.6.0-ibm-demo 1.6.0.7-1jpp.2.el5, java-1.6.0-ibm-jdbc 1.6.0.7-1jpp.2.el5, java-1.6.0-sun-src 1.6.0.17-1jpp.2.el5, +6 more Red Hat Enterprise Linux ES version 4 Extras java-1.6.0-ibm 1.6.0.7-1jpp.3.el4, java-1.6.0-sun 1.6.0.17-1jpp.1.el4, java-1.6.0-ibm-src 1.6.0.7-1jpp.3.el4, java-1.6.0-ibm-demo 1.6.0.7-1jpp.3.el4, java-1.6.0-ibm-jdbc 1.6.0.7-1jpp.3.el4, java-1.6.0-sun-src 1.6.0.17-1jpp.1.el4, +5 more Red Hat Enterprise Linux Server Supplementary (v. 5) java-1.6.0-ibm 1.6.0.7-1jpp.2.el5, java-1.6.0-sun 1.6.0.17-1jpp.2.el5, java-1.6.0-ibm-src 1.6.0.7-1jpp.2.el5, java-1.6.0-ibm-demo 1.6.0.7-1jpp.2.el5, java-1.6.0-ibm-jdbc 1.6.0.7-1jpp.2.el5, java-1.6.0-sun-src 1.6.0.17-1jpp.2.el5, +6 more Red Hat Enterprise Linux WS version 4 Extras java-1.6.0-ibm 1.6.0.7-1jpp.3.el4, java-1.6.0-sun 1.6.0.17-1jpp.1.el4, java-1.6.0-ibm-src 1.6.0.7-1jpp.3.el4, java-1.6.0-ibm-demo 1.6.0.7-1jpp.3.el4, java-1.6.0-ibm-jdbc 1.6.0.7-1jpp.3.el4, java-1.6.0-sun-src 1.6.0.17-1jpp.1.el4, +5 more
    fixed: vendor fix RHSA-2009:1694
  • Red Hat Satellite 5.3 (RHEL v.4) java-1.6.0-ibm 1.6.0.7-1jpp.3.el4 Red Hat Satellite 5.3 (RHEL v.5) java-1.6.0-ibm 1.6.0.7-1jpp.2.el5
    fixed: vendor fix RHSA-2010:0043

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.18% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.