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CVE-2009-1839

26
FAUCET Score

CVE-2009-1839 describes a vulnerability in Mozilla Firefox 3 prior to version 3.0.11 where an incorrect principal is associated with file: URLs loaded via the location bar. This flaw allows user-assisted remote attackers to bypass access restrictions and read local files through a crafted HTML document, a technique known as "file-URL-to-file-URL scripting." The vulnerability has a CVSS score of 5.4, indicating a medium severity, with high attack complexity and a critical impact on confidentiality. While there is no evidence of active exploitation or Metasploit/Nuclei modules, an ExploitDB entry (EDB-10544) for location bar spoofing exists, and the vulnerability has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.0.10CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:3.0:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:3.0:alpha:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:3.0:beta2:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:3.0:beta5:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.4MEDIUM

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

Confidentiality Impact
COMPLETE
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
7.12%
Probability of exploitation in next 30 days
EPSS Percentile
93.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-10544 · Dec 18, 2009
This CVE's current EPSS score of 0.0712 is in the 93rd percentile among its peer group of 19,956 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 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-2009-1839Moderate

Firefox information disclosure flaw

Jun 11, 2009

References

osvdb.org / 55163
bugzilla.mozilla.org / show_bug.cgi
bugzilla.redhat.com / show_bug.cgi
secunia.com / advisories/35331
Vendor Advisory
secunia.com / advisories/35415
secunia.com / advisories/35431
Vendor Advisory
secunia.com / advisories/35468
slackware.com / security/viewer.php
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9256
rhn.redhat.com / errata/RHSA-2009-1095.html
sunsolve.sun.com / search/document.do
redhat.com / archives/fedora-package-announce/2009-June/msg00574.html
redhat.com / archives/fedora-package-announce/2009-June/msg00657.html
debian.org / security/2009/dsa-1820
mozilla.org / security/announce/2009/mfsa2009-30.html
Vendor Advisory
securityfocus.com / bid/35326
Patch
securityfocus.com / bid/35386
vupen.com / english/advisories/2009/1572
PatchVendor Advisory