CVE-2009-1837

CVE-2009-1837 is a high-severity vulnerability in Redhat Enterprise Linux with a CVSS 3.x base score of 7.5. 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-362.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• CVSS v2: 9.3
• EPSS exploit prediction: 4% (90th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-362
• Affected product: Redhat Enterprise Linux
• Published: 2009-06-12
• Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2009-1837?

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.

How severe is CVE-2009-1837?

CVE-2009-1837 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2009-1837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-1837?

CVE-2009-1837 primarily affects Redhat Enterprise Linux. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1837?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2009-1837 published?

CVE-2009-1837 was published on 2009-06-12 and last updated on 2026-06-16.

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
• http://www.securityfocus.com/bid/35360
• http://www.securitytracker.com/id?1022386
• http://www.vupen.com/english/advisories/2009/1572
• https://bugzilla.mozilla.org/show_bug.cgi?id=486269
• https://bugzilla.redhat.com/show_bug.cgi?id=503579
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10628
• https://rhn.redhat.com/errata/RHSA-2009-1095.html
• https://www.redhat.com/archives/fedora-package-announce/2009-June/msg00574.html
• https://www.redhat.com/archives/fedora-package-announce/2009-June/msg00657.html

Affected products (15)

• cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:9:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:10:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:4.8:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_eus:5.3:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_server_aus:5.3:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*

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