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CVE-2009-3866

25
FAUCET Score

CVE-2009-3866 describes a critical vulnerability in the Java Web Start Installer within Sun Java SE JDK and JRE 6 prior to Update 17. This flaw allows remote attackers to execute arbitrary code by manipulating JNLP files, bypassing security model permissions during installer extension removal. With a CVSS score of 9.3 (Critical), the vulnerability is network-exploitable with medium attack complexity, leading to complete compromise of confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
1.6.0CPE matchmatch criteria
cpe:2.3:a:sun:jdk:1.6.0:update_1:*:*:*:*:*:*
1.6.0CPE matchmatch criteria
cpe:2.3:a:sun:jdk:1.6.0:update_10:*:*:*:*:*:*
1.6.0CPE matchmatch criteria
cpe:2.3:a:sun:jdk:1.6.0:update_11:*:*:*:*:*:*
1.6.0CPE matchmatch criteria
cpe:2.3:a:sun:jdk:1.6.0:update_12:*:*:*:*:*:*
1.6.0CPE matchmatch criteria
cpe:2.3:a:sun:jdk:1.6.0:update_13:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

9.3HIGH

AV:N/AC:M/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
6.18%
Probability of exploitation in next 30 days
EPSS Percentile
92.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0618 is in the 67th percentile among its peer group of 8,920 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Extras for RHEL 4Fixed in: java-1.6.0-sun-1:1.6.0.17-1jpp.1.el4
View patch
redhatpatch availablevia redhat_api
Product: Extras for RHEL 4Fixed in: java-1.6.0-ibm-1:1.6.0.7-1jpp.3.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Network Satellite Server v 5.3Fixed in: java-1.6.0-ibm-1:1.6.0.7-1jpp.3.el4
View patch
redhatpatch availablevia redhat_api
Product: Supplementary for Red Hat Enterprise Linux 5Fixed in: java-1.6.0-sun-1:1.6.0.17-1jpp.2.el5
View patch
redhatpatch availablevia redhat_api
Product: Supplementary for Red Hat Enterprise Linux 5Fixed in: java-1.6.0-ibm-1:1.6.0.7-1jpp.2.el5
View patch

Vendor Advisories (1)

redhatCVE-2009-3866Important

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

Nov 3, 2009

References

java.sun.com / javase/6/webnotes/6u17.html
Vendor Advisory
lists.apple.com / archives/security-announce/2009/Dec/msg00000.html
lists.apple.com / archives/security-announce/2009/Dec/msg00001.html
lists.opensuse.org / opensuse-security-announce/2009-11/msg00010.html
marc.info
secunia.com / advisories/37231
Vendor Advisory
secunia.com / advisories/37239
secunia.com / advisories/37386
secunia.com / advisories/37581
secunia.com / advisories/37841
security.gentoo.org / glsa/glsa-200911-02.xml
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6635
sunsolve.sun.com / search/document.do
PatchVendor Advisory
support.apple.com / kb/HT3969
support.apple.com / kb/HT3970
redhat.com / support/errata/RHSA-2009-1694.html
securityfocus.com / bid/36881
vupen.com / english/advisories/2009/3131
PatchVendor Advisory
zerodayinitiative.com / advisories/ZDI-09-077
Patch