What’s Vulnerable › Vulnerabilities

CVE-2009-1837

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2009-06-12 · updated 2026-06-16
• Weakness: CWE-362

Description

Race condition in the NPObjWrapper_NewResolve function in modules/plugin/base/src/nsJSNPRuntime.cpp in xul.dll in Mozilla Firefox 3 before 3.0.11 might allow remote attackers to execute arbitrary code via a page transition during Java applet loading, related to a use-after-free vulnerability for memory associated with a destroyed Java object.

Affected products

• Debian Linux: 5.0
• Fedoraproject Fedora: 9, 10
• Mozilla Firefox: from 3.0 before 3.0.11 — fixed in 3.0.11
• Red Hat Enterprise Linux: 4.0, 5.0
• RedHat Enterprise Linux Desktop: 4.0, 5.0
• RedHat Enterprise Linux Eus: 4.8, 5.3
• RedHat Enterprise Linux Server: 4.0, 5.0
• RedHat Enterprise Linux Server Aus: 5.3
• RedHat Enterprise Linux Workstation: 4.0, 5.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 3.0.11. Check the vendor advisory for mitigations.

References

• http://secunia.com/advisories/34241
• http://secunia.com/advisories/35331
• http://secunia.com/advisories/35415
• http://secunia.com/advisories/35431
• http://secunia.com/advisories/35468
• http://secunia.com/secunia_research/2009-19/
• http://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.372468
• http://sunsolve.sun.com/search/document.do?assetkey=1-66-264308-1
• http://www.debian.org/security/2009/dsa-1820
• http://www.mozilla.org/security/announce/2009/mfsa2009-28.html
• http://www.securityfocus.com/archive/1/504260/100/0/threaded
• http://www.securityfocus.com/bid/35326

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