How severe is CVE-2006-5783?

CVE-2006-5783 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2006-5783 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-5783?

CVE-2006-5783 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2006-5783?

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-2006-5783 published?

CVE-2006-5783 was published on 2006-11-07 and last updated on 2026-06-16.

CVE-2006-5783

CVE-2006-5783 is a high-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Mozilla Firefox
Published: 2006-11-07
Last modified: 2026-06-16

Description

Firefox 1.5.0.7 on Kubuntu Linux allows remote attackers to cause a denial of service (crash) via a long URL in an A tag. NOTE: this issue has been disputed by several vendors, who could not reproduce the report. In addition, the scope of the impact - system freeze - suggests an issue that is not related to Firefox. Due to this impact, CVE concurs with the dispute

Frequently asked questions

What is CVE-2006-5783?: Firefox 1.5.0.7 on Kubuntu Linux allows remote attackers to cause a denial of service (crash) via a long URL in an A tag. NOTE: this issue has been disputed by several vendors, who could not reproduce the report. In addition, the scope of the impact - system freeze - suggests an issue that is not related to Firefox. Due to this impact, CVE concurs with the dispute
How severe is CVE-2006-5783?: CVE-2006-5783 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2006-5783 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-5783?: CVE-2006-5783 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2006-5783?: 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-2006-5783 published?: CVE-2006-5783 was published on 2006-11-07 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:mozilla:firefox:1.5.0.7:*:*:*:*:*:*:*

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