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Fencer Vulns
high 7.5

CVE-2005-2270 json

Firefox before 1.0.5 and Mozilla before 1.7.9 does not properly clone base objects, which allows remote attackers to execute arbitrary code…

published 2005-07-13 21 y ago modified 2026-06-16 4 mo ago also EUVD-2005-2271

cvss
7.5
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.0%
EPSS 6.0% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

Firefox before 1.0.5 and Mozilla before 1.7.9 does not properly clone base objects, which allows remote attackers to execute arbitrary code by navigating the prototype chain to reach a privileged object.

Patch / fix

  • thunderbird RHEL 4 1.0.6-1.4.1
  • devhelp RHEL 4 0.9.2-2.4.6
  • firefox RHEL 4 1.0.6-1.4.1

red hat advisories RHSA-2005:601RHSA-2005:587RHSA-2005:586

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-2005-2270 updated

security flaw

  • Red Hat Enterprise Linux AS version 4 devhelp 0.9.2-2.4.6, firefox 1.0.6-1.4.1, thunderbird 1.0.6-1.4.1 Red Hat Enterprise Linux Desktop version 4 devhelp 0.9.2-2.4.6, firefox 1.0.6-1.4.1, thunderbird 1.0.6-1.4.1 Red Hat Enterprise Linux ES version 4 devhelp 0.9.2-2.4.6, firefox 1.0.6-1.4.1, thunderbird 1.0.6-1.4.1 Red Hat Enterprise Linux WS version 4 devhelp 0.9.2-2.4.6, firefox 1.0.6-1.4.1, thunderbird 1.0.6-1.4.1
    fixed: vendor fix RHSA-2005:587

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

5.96% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=294795 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=295011 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=294799 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=296397 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

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.