CVE-2005-2270

CVE-2005-2270 is a high-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

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.

Frequently asked questions

What is CVE-2005-2270?
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.
How severe is CVE-2005-2270?
CVE-2005-2270 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2005-2270 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-2270?
CVE-2005-2270 primarily affects Mozilla Firefox. In total, 38 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2005-2270?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2005-2270 published?
CVE-2005-2270 was published on 2005-07-13 and last updated on 2026-06-16.

References

Affected products (38)

More vulnerabilities in Mozilla Firefox

All CVEs affecting Mozilla Firefox →