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Fencer Vulns
medium 5.0

CVE-2008-5510 json

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 1.1.1…

published 2008-12-17 17 y ago modified 2026-06-16 4 mo ago also EUVD-2008-5487

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

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.

Patch / fix

  • mozilla firefox 2.0.0.19, 3.0.5
  • mozilla seamonkey 1.1.14
  • mozilla thunderbird 2.0.0.19
  • firefox RHEL 4 3.0.5-1.el4
  • firefox RHEL 5 3.0.5-1.el5_2
  • nss RHEL 4 3.12.2.0-1.el4
  • nss RHEL 5 3.12.2.0-2.el5
  • nspr RHEL 4 4.7.3-1.el4
  • nspr RHEL 5 4.7.3-2.el5
  • nss-tools RHEL 5 3.12.2.0-2.el5
  • xulrunner RHEL 5 1.9.0.5-1.el5_2

red hat advisories RHSA-2008:1036

  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1

opensuse advisories openSUSE-SU-2024:10601-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2008-5510 updated

Firefox null characters ignored by CSS parser

  • Red Hat Enterprise Linux (v. 5 server) nspr 4.7.3-2.el5, nss 3.12.2.0-2.el5, firefox 3.0.5-1.el5_2, nss-tools 3.12.2.0-2.el5, xulrunner 1.9.0.5-1.el5_2, xulrunner-devel-unstable 1.9.0.5-1.el5_2 Red Hat Enterprise Linux AS version 4 nspr 4.7.3-1.el4, nss 3.12.2.0-1.el4, firefox 3.0.5-1.el4 Red Hat Enterprise Linux Desktop (v. 5 client) nspr 4.7.3-2.el5, nss 3.12.2.0-2.el5, firefox 3.0.5-1.el5_2, nss-tools 3.12.2.0-2.el5, xulrunner 1.9.0.5-1.el5_2, xulrunner-devel-unstable 1.9.0.5-1.el5_2 Red Hat Enterprise Linux Desktop version 4 nspr 4.7.3-1.el4, nss 3.12.2.0-1.el4, firefox 3.0.5-1.el4 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) nspr 4.7.3-2.el5, nss 3.12.2.0-2.el5, nss-tools 3.12.2.0-2.el5, xulrunner 1.9.0.5-1.el5_2, xulrunner-devel-unstable 1.9.0.5-1.el5_2 Red Hat Enterprise Linux ES version 4 nspr 4.7.3-1.el4, nss 3.12.2.0-1.el4, firefox 3.0.5-1.el4
    +1 more products
    Red Hat Enterprise Linux WS version 4 nspr 4.7.3-1.el4, nss 3.12.2.0-1.el4, firefox 3.0.5-1.el4
    fixed: vendor fix RHSA-2008:1036

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.21% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.