CVE-2008-5510: The CSS parser in Mozilla Firefox 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 ignores t...

Description

The CSS parser in Mozilla Firefox 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 ignores the '\0' escaped null character, which might allow remote attackers to bypass protection mechanisms such as sanitization routines.

Metrics

EPSS Probability

2.21%

80.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	>= 2.0, < 2.0.0.19
Mozilla	Firefox	>= 3.0, < 3.0.5
Mozilla	Seamonkey	>= 1.0, < 1.1.14
Mozilla	Thunderbird	>= 2.0, < 2.0.0.19
Canonical	Ubuntu Linux	7.10
Canonical	Ubuntu Linux	8.04
Canonical	Ubuntu Linux	8.10
Debian	Debian Linux	4.0
Debian	Debian Linux	5.0

References

http://secunia.com/advisories/33184Third Party Advisory
http://secunia.com/advisories/33188Third Party Advisory
http://secunia.com/advisories/33203Third Party Advisory
http://secunia.com/advisories/33204Third Party Advisory
http://secunia.com/advisories/33205Third Party Advisory
http://secunia.com/advisories/33216Third Party Advisory
http://secunia.com/advisories/33231Third Party Advisory
http://secunia.com/advisories/33408Third Party Advisory
http://secunia.com/advisories/33523Third Party Advisory
http://secunia.com/advisories/34501Third Party Advisory
http://secunia.com/advisories/35080Third Party Advisory
http://sunsolve.sun.com/search/document.do?assetkey=1-26-256408-1Broken Link
http://sunsolve.sun.com/search/document.do?assetkey=1-26-258748-1Broken Link
http://www.debian.org/security/2009/dsa-1707Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2008:244Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2008:245Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2009:012Third Party Advisory
http://www.mozilla.org/security/announce/2008/mfsa2008-67.htmlVendor Advisory
http://www.redhat.com/support/errata/RHSA-2008-1036.htmlThird Party Advisory
http://www.securityfocus.com/bid/32882Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1021425Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/usn-690-2Third Party Advisory
http://www.ubuntu.com/usn/usn-701-1Third Party Advisory
http://www.vupen.com/english/advisories/2009/0977Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=228856Issue Tracking, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/47415Third Party Advisory, VDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9662Third Party Advisory
https://usn.ubuntu.com/690-1/Third Party Advisory
http://secunia.com/advisories/33184Third Party Advisory
http://secunia.com/advisories/33188Third Party Advisory
http://secunia.com/advisories/33203Third Party Advisory
http://secunia.com/advisories/33204Third Party Advisory
http://secunia.com/advisories/33205Third Party Advisory
http://secunia.com/advisories/33216Third Party Advisory
http://secunia.com/advisories/33231Third Party Advisory
http://secunia.com/advisories/33408Third Party Advisory
http://secunia.com/advisories/33523Third Party Advisory
http://secunia.com/advisories/34501Third Party Advisory
http://secunia.com/advisories/35080Third Party Advisory
http://sunsolve.sun.com/search/document.do?assetkey=1-26-256408-1Broken Link
http://sunsolve.sun.com/search/document.do?assetkey=1-26-258748-1Broken Link
http://www.debian.org/security/2009/dsa-1707Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2008:244Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2008:245Third Party Advisory
http://www.mandriva.com/security/advisories?name=MDVSA-2009:012Third Party Advisory
http://www.mozilla.org/security/announce/2008/mfsa2008-67.htmlVendor Advisory
http://www.redhat.com/support/errata/RHSA-2008-1036.htmlThird Party Advisory
http://www.securityfocus.com/bid/32882Third Party Advisory, VDB Entry
http://www.securitytracker.com/id?1021425Third Party Advisory, VDB Entry
http://www.ubuntu.com/usn/usn-690-2Third Party Advisory
http://www.ubuntu.com/usn/usn-701-1Third Party Advisory
http://www.vupen.com/english/advisories/2009/0977Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=228856Issue Tracking, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/47415Third Party Advisory, VDB Entry
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9662Third Party Advisory
https://usn.ubuntu.com/690-1/Third Party Advisory

Timeline

Published: Dec 17, 2008
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2008-5510?

The CSS parser in Mozilla Firefox 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 ignores the '\0' escaped null character, which might allow remote attackers to bypass protection mechanisms such as sanitization routines.

How severe is CVE-2008-5510?

Severity scoring for CVE-2008-5510 is pending analysis. The EPSS model estimates a 2.21% probability of exploitation in the next 30 days.

How do I fix CVE-2008-5510?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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