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CVE-2008-5510

17
FAUCET Score

CVE-2008-5510 describes a vulnerability in the CSS parser of Mozilla Firefox (versions 3.x before 3.0.5 and 2.x before 2.0.0.19), Thunderbird (2.x before 2.0.0.19), and SeaMonkey (1.x before 1.1.14), where it incorrectly ignores the '\0' escaped null character. This flaw could allow remote attackers to bypass security mechanisms like sanitization routines. With a CVSS score of 5.0 (medium severity), this vulnerability is network-exploitable with low attack complexity, potentially leading to partial integrity impact without requiring authentication. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0, < 2.0.0.19CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
>= 3.0, < 3.0.5CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
>= 1.0, < 1.1.14CPE matchmatch criteria
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
>= 2.0, < 2.0.0.19CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
7.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:7.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.21%
Probability of exploitation in next 30 days
EPSS Percentile
80.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0221 is in the 70th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 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 (8)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:1.9.0.5-1.el5_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: firefox-0:3.0.5-1.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: nspr-0:4.7.3-1.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: nss-0:3.12.2.0-1.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:3.0.5-1.el5_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nspr-0:4.7.3-2.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nss-0:3.12.2.0-2.el5
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2008-5510Low

Firefox null characters ignored by CSS parser

Dec 16, 2008

References

bugzilla.mozilla.org / show_bug.cgi
Issue TrackingVendor Advisory
secunia.com / advisories/33184
Third Party Advisory
secunia.com / advisories/33188
Third Party Advisory
secunia.com / advisories/33203
Third Party Advisory
secunia.com / advisories/33204
Third Party Advisory
secunia.com / advisories/33205
Third Party Advisory
secunia.com / advisories/33216
Third Party Advisory
secunia.com / advisories/33231
Third Party Advisory
secunia.com / advisories/33408
Third Party Advisory
secunia.com / advisories/33523
Third Party Advisory
secunia.com / advisories/34501
Third Party Advisory
secunia.com / advisories/35080
Third Party Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/47415
Third Party AdvisoryVDB Entry
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9662
Third Party Advisory
sunsolve.sun.com / search/document.do
Broken Link
sunsolve.sun.com / search/document.do
Broken Link
usn.ubuntu.com / 690-1
Third Party Advisory
debian.org / security/2009/dsa-1707
Third Party Advisory
mandriva.com / security/advisories
Third Party Advisory
mandriva.com / security/advisories
Third Party Advisory
mandriva.com / security/advisories
Third Party Advisory
mozilla.org / security/announce/2008/mfsa2008-67.html
Vendor Advisory
redhat.com / support/errata/RHSA-2008-1036.html
Third Party Advisory
securityfocus.com / bid/32882
Third Party AdvisoryVDB Entry
securitytracker.com / id
Third Party AdvisoryVDB Entry
ubuntu.com / usn/usn-690-2
Third Party Advisory
ubuntu.com / usn/usn-701-1
Third Party Advisory
vupen.com / english/advisories/2009/0977
Third Party Advisory