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CVE-2009-1837

20
FAUCET Score

CVE-2009-1837 describes a race condition in Mozilla Firefox versions prior to 3.0.11, specifically within the NPObjWrapper_NewResolve function, which could lead to remote code execution. This vulnerability, affecting products like Debian, Fedora, and Red Hat, stems from a use-after-free error when a page transition occurs during Java applet loading. With a CVSS score of 7.5 (High), successful exploitation requires user interaction and a high attack complexity, but could result in full compromise of confidentiality, integrity, and availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0, < 3.0.11CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
5.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*
9CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:9:*:*:*:*:*:*:*
10CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:10:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:4.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.33%
Probability of exploitation in next 30 days
EPSS Percentile
90.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0433 is in the 58th percentile among its peer group of 1,572 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, 0.4 Bluesky, 0.2 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.6 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: firefox-0:3.0.11-4.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:3.0.11-2.el5_3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:1.9.0.11-3.el5_3
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2009-1837Critical

Firefox Race condition while accessing the private data of a NPObject JS wrapper class object

Jun 11, 2009

References

bugzilla.mozilla.org / show_bug.cgi
ExploitIssue Tracking
bugzilla.redhat.com / show_bug.cgi
Issue Tracking
secunia.com / advisories/34241
Broken LinkVendor Advisory
secunia.com / advisories/35331
Broken LinkVendor Advisory
secunia.com / advisories/35415
Broken Link
secunia.com / advisories/35431
Broken LinkVendor Advisory
secunia.com / advisories/35468
Broken Link
secunia.com / secunia_research/2009-19
Broken LinkVendor Advisory
slackware.com / security/viewer.php
Broken Link
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10628
Broken Link
rhn.redhat.com / errata/RHSA-2009-1095.html
Third Party Advisory
sunsolve.sun.com / search/document.do
Broken Link
redhat.com / archives/fedora-package-announce/2009-June/msg00574.html
Mailing List
redhat.com / archives/fedora-package-announce/2009-June/msg00657.html
Mailing List
debian.org / security/2009/dsa-1820
Mailing ListThird Party Advisory
mozilla.org / security/announce/2009/mfsa2009-28.html
Vendor Advisory
securityfocus.com / archive/1/504260/100/0/threaded
Broken LinkThird Party AdvisoryVDB Entry
securityfocus.com / bid/35326
Broken LinkThird Party AdvisoryVDB Entry
securityfocus.com / bid/35360
Broken LinkThird Party AdvisoryVDB Entry
securitytracker.com / id
Broken LinkThird Party AdvisoryVDB Entry
vupen.com / english/advisories/2009/1572
Broken LinkVendor Advisory