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CVE-2008-4066

14
FAUCET Score

CVE-2008-4066 describes a cross-site scripting (XSS) bypass vulnerability in Mozilla Firefox versions prior to 2.0.0.17. Remote attackers could exploit this by using HTML-escaped low surrogate characters, which the browser's HTML parser would ignore, effectively circumventing XSS protection. This vulnerability has a CVSS score of 4.3, indicating a medium attack complexity and potential for partial integrity impact, with no confidentiality or availability impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.0.0.14CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:2.0.0.14:*:*:*:*:*:*:*
2.0.0.15CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:2.0.0.15:*:*:*:*:*:*:*
2.0.0.16CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:2.0.0.16:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.76%
Probability of exploitation in next 30 days
EPSS Percentile
75.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0176 is in the 54th percentile among its peer group of 19,958 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 (6)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 2.1Fixed in: seamonkey-0:1.0.9-0.20.el2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 3Fixed in: seamonkey-0:1.0.9-0.24.el3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: devhelp-0:0.10-0.10.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: seamonkey-0:1.0.9-26.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: thunderbird-0:1.5.0.12-16.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:2.0.0.17-1.el5
View patch

Vendor Advisories (1)

redhatCVE-2008-4066Moderate

Mozilla low surrogates stripped from JavaScript before execution

Sep 23, 2008

References

blogs.technet.com / bluehat/archive/2008/08/14/targeted-fuzzing.aspx
Exploit
download.novell.com / Download
jvndb.jvn.jp / ja/contents/2011/JVNDB-2011-000058.html
jvn.jp / en/jp/JVN96950482/index.html
lists.opensuse.org / opensuse-security-announce/2008-10/msg00005.html
bugzilla.mozilla.org / show_bug.cgi
secunia.com / advisories/31984
Vendor Advisory
secunia.com / advisories/31985
Vendor Advisory
secunia.com / advisories/32007
Vendor Advisory
secunia.com / advisories/32010
Vendor Advisory
secunia.com / advisories/32012
Vendor Advisory
secunia.com / advisories/32025
Vendor Advisory
secunia.com / advisories/32042
Vendor Advisory
secunia.com / advisories/32044
Vendor Advisory
secunia.com / advisories/32082
Vendor Advisory
secunia.com / advisories/32092
Vendor Advisory
secunia.com / advisories/32144
Vendor Advisory
secunia.com / advisories/32185
secunia.com / advisories/32196
secunia.com / advisories/32845
Vendor Advisory
secunia.com / advisories/34501
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/45358
slackware.com / security/viewer.php
slackware.com / security/viewer.php
slackware.com / security/viewer.php
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8880
sunsolve.sun.com / search/document.do
redhat.com / archives/fedora-package-announce/2008-September/msg01384.html
Vendor Advisory
redhat.com / archives/fedora-package-announce/2008-September/msg01403.html
debian.org / security/2008/dsa-1649
debian.org / security/2008/dsa-1669
mandriva.com / security/advisories
mandriva.com / security/advisories
mozilla.org / security/announce/2008/mfsa2008-43.html
redhat.com / support/errata/RHSA-2008-0882.html
Vendor Advisory
redhat.com / support/errata/RHSA-2008-0908.html
Vendor Advisory
securityfocus.com / bid/31346
securitytracker.com / id
thespanner.co.uk / 2008/06/30/javascript-protocol-fuzz-results
Exploit
ubuntu.com / usn/usn-645-1
ubuntu.com / usn/usn-645-2
ubuntu.com / usn/usn-647-1
vupen.com / english/advisories/2008/2661
Vendor Advisory
vupen.com / english/advisories/2009/0977
Vendor Advisory