Is CVE-2008-5510 being actively exploited?

CVE-2008-5510 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2008-5510?

CVE-2008-5510 has a CVSS 2.0 base score of 5.0 (MEDIUM).

CVE-2008-5510

MEDIUM · CVSS 5.0EPSS 2.2%EU EUVD

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.

Key facts

CVSS score: 5.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:N/C:N/I:P/A:N
EPSS score: 2.2% (83th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2008-5487)
Published: December 17, 2008
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2008-5487 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
debian / debian linux
mozilla / firefox
mozilla / seamonkey
mozilla / thunderbird

References

http://secunia.com/advisories/33184(Third Party Advisory)
http://secunia.com/advisories/33188(Third Party Advisory)
http://secunia.com/advisories/33203(Third Party Advisory)
http://secunia.com/advisories/33204(Third Party Advisory)
http://secunia.com/advisories/33205(Third Party Advisory)
http://secunia.com/advisories/33216(Third Party Advisory)
http://secunia.com/advisories/33231(Third Party Advisory)
http://secunia.com/advisories/33408(Third Party Advisory)
http://secunia.com/advisories/33523(Third Party Advisory)
http://secunia.com/advisories/34501(Third Party Advisory)
http://secunia.com/advisories/35080(Third Party Advisory)
http://sunsolve.sun.com/search/document.do?assetkey=1-26-256408-1(Broken Link)
http://sunsolve.sun.com/search/document.do?assetkey=1-26-258748-1(Broken Link)
http://www.debian.org/security/2009/dsa-1707(Third Party Advisory)
http://www.mandriva.com/security/advisories?name=MDVSA-2008:244(Third Party Advisory)
http://www.mandriva.com/security/advisories?name=MDVSA-2008:245(Third Party Advisory)
http://www.mandriva.com/security/advisories?name=MDVSA-2009:012(Third Party Advisory)
http://www.mozilla.org/security/announce/2008/mfsa2008-67.html(Vendor Advisory)
http://www.redhat.com/support/errata/RHSA-2008-1036.html(Third Party Advisory)
http://www.securityfocus.com/bid/32882(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id?1021425(Third Party Advisory, VDB Entry)
http://www.ubuntu.com/usn/usn-690-2(Third Party Advisory)
http://www.ubuntu.com/usn/usn-701-1(Third Party Advisory)
http://www.vupen.com/english/advisories/2009/0977(Third Party Advisory)
https://bugzilla.mozilla.org/show_bug.cgi?id=228856(Issue Tracking, Vendor Advisory)
https://exchange.xforce.ibmcloud.com/vulnerabilities/47415(Third Party Advisory, VDB Entry)
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9662(Third Party Advisory)
https://usn.ubuntu.com/690-1/(Third Party Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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