CVE-2006-1993

CVE-2006-1993 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 5.1. Its EPSS exploit-prediction score of 51% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

Description

Mozilla Firefox 1.5.0.2, when designMode is enabled, allows remote attackers to cause a denial of service and possibly execute arbitrary code via certain Javascript that is not properly handled by the contentWindow.focus method in an iframe, which causes a reference to a deleted controller context object. NOTE: this was originally claimed to be a buffer overflow in (1) js320.dll and (2) xpcom_core.dll, but the vendor disputes this claim.

Frequently asked questions

What is CVE-2006-1993?
Mozilla Firefox 1.5.0.2, when designMode is enabled, allows remote attackers to cause a denial of service and possibly execute arbitrary code via certain Javascript that is not properly handled by the contentWindow.focus method in an iframe, which causes a reference to a deleted controller context object. NOTE: this was originally claimed to be a buffer overflow in (1) js320.dll and (2) xpcom_core.dll, but the vendor disputes this claim.
How severe is CVE-2006-1993?
CVE-2006-1993 has a CVSS 2.0 base score of 5.1, rated medium severity.
Is CVE-2006-1993 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 51% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-1993?
CVE-2006-1993 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-1993?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-1993 published?
CVE-2006-1993 was published on 2006-04-25 and last updated on 2026-06-16.

References

Affected products (1)

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