How severe is CVE-2006-3740?

CVE-2006-3740 has a CVSS 2.0 base score of 7.2, rated high severity.

Is CVE-2006-3740 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-3740?

CVE-2006-3740 primarily affects X.org. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2006-3740?

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-2006-3740 published?

CVE-2006-3740 was published on 2006-09-13 and last updated on 2026-06-16.

CVE-2006-3740

CVE-2006-3740 is a high-severity vulnerability in X.org with a CVSS 2.0 base score of 7.2. 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 7.2)
EPSS exploit prediction: 1% (39th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: X.org
Published: 2006-09-13
Last modified: 2026-06-16

Description

Integer overflow in the scan_cidfont function in X.Org 6.8.2 and XFree86 X server allows local users to execute arbitrary code via crafted (1) CMap and (2) CIDFont font data with modified item counts in the (a) begincodespacerange, (b) cidrange, and (c) notdefrange sections.

Frequently asked questions

What is CVE-2006-3740?: Integer overflow in the scan_cidfont function in X.Org 6.8.2 and XFree86 X server allows local users to execute arbitrary code via crafted (1) CMap and (2) CIDFont font data with modified item counts in the (a) begincodespacerange, (b) cidrange, and (c) notdefrange sections.
How severe is CVE-2006-3740?: CVE-2006-3740 has a CVSS 2.0 base score of 7.2, rated high severity.
Is CVE-2006-3740 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-3740?: CVE-2006-3740 primarily affects X.org. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-3740?: 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-2006-3740 published?: CVE-2006-3740 was published on 2006-09-13 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:a:x.org:x.org:6.8.2:*:*:*:*:*:*:*
cpe:2.3:a:xfree86_project:xfree86_x:*:*:*:*:*:*:*:*

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