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Fencer Vulns
high 7.2

CVE-2006-3740 json

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…

published 2006-09-13 20 y ago modified 2026-06-16 4 mo ago also EUVD-2006-3734

cvss
7.2
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits
0
none known

Summary

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.

Patch / fix

  • libxfont Debian 14, Debian 13, Debian 12 1:1.2.2-1

debian advisories DEBIAN-CVE-2006-3740

  • XFree86 RHEL 3 4.3.0-113.EL
  • XFree86-sdk RHEL 3 4.3.0-113.EL
  • XFree86-twm RHEL 3 4.3.0-113.EL
  • XFree86-xdm RHEL 3 4.3.0-113.EL
  • XFree86-xfs RHEL 3 4.3.0-113.EL
  • XFree86-libs RHEL 3 4.3.0-113.EL
  • XFree86-Xvfb RHEL 3 4.3.0-113.EL
  • XFree86-tools RHEL 3 4.3.0-113.EL

red hat advisories RHSA-2006:0666RHSA-2006:0665

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-2006-3740 updated

security flaw

  • Red Hat Desktop version 3 XFree86 4.3.0-113.EL, XFree86-sdk 4.3.0-113.EL, XFree86-twm 4.3.0-113.EL, XFree86-xdm 4.3.0-113.EL, XFree86-xfs 4.3.0-113.EL, XFree86-libs 4.3.0-113.EL, +22 more Red Hat Enterprise Linux AS version 3 XFree86 4.3.0-113.EL, XFree86-sdk 4.3.0-113.EL, XFree86-twm 4.3.0-113.EL, XFree86-xdm 4.3.0-113.EL, XFree86-xfs 4.3.0-113.EL, XFree86-libs 4.3.0-113.EL, +22 more
    fixed: vendor fix RHSA-2006:0666
  • Red Hat Enterprise Linux AS version 4 xorg-x11 6.8.2-1.EL.13.37.2, xorg-x11-sdk 6.8.2-1.EL.13.37.2, xorg-x11-twm 6.8.2-1.EL.13.37.2, xorg-x11-xdm 6.8.2-1.EL.13.37.2, xorg-x11-xfs 6.8.2-1.EL.13.37.2, xorg-x11-libs 6.8.2-1.EL.13.37.2, +9 more Red Hat Enterprise Linux Desktop version 4 xorg-x11 6.8.2-1.EL.13.37.2, xorg-x11-sdk 6.8.2-1.EL.13.37.2, xorg-x11-twm 6.8.2-1.EL.13.37.2, xorg-x11-xdm 6.8.2-1.EL.13.37.2, xorg-x11-xfs 6.8.2-1.EL.13.37.2, xorg-x11-libs 6.8.2-1.EL.13.37.2, +9 more
    fixed: vendor fix RHSA-2006:0665
  • Red Hat Enterprise Linux ES version 3 XFree86 4.3.0-113.EL, XFree86-sdk 4.3.0-113.EL, XFree86-twm 4.3.0-113.EL, XFree86-xdm 4.3.0-113.EL, XFree86-xfs 4.3.0-113.EL, XFree86-libs 4.3.0-113.EL, +22 more
    fixed: vendor fix RHSA-2006:0666
  • Red Hat Enterprise Linux ES version 4 xorg-x11 6.8.2-1.EL.13.37.2, xorg-x11-sdk 6.8.2-1.EL.13.37.2, xorg-x11-twm 6.8.2-1.EL.13.37.2, xorg-x11-xdm 6.8.2-1.EL.13.37.2, xorg-x11-xfs 6.8.2-1.EL.13.37.2, xorg-x11-libs 6.8.2-1.EL.13.37.2, +9 more
    fixed: vendor fix RHSA-2006:0665
  • Red Hat Enterprise Linux WS version 3 XFree86 4.3.0-113.EL, XFree86-sdk 4.3.0-113.EL, XFree86-twm 4.3.0-113.EL, XFree86-xdm 4.3.0-113.EL, XFree86-xfs 4.3.0-113.EL, XFree86-libs 4.3.0-113.EL, +22 more
    fixed: vendor fix RHSA-2006:0666
  • Red Hat Enterprise Linux WS version 4 xorg-x11 6.8.2-1.EL.13.37.2, xorg-x11-sdk 6.8.2-1.EL.13.37.2, xorg-x11-twm 6.8.2-1.EL.13.37.2, xorg-x11-xdm 6.8.2-1.EL.13.37.2, xorg-x11-xfs 6.8.2-1.EL.13.37.2, xorg-x11-libs 6.8.2-1.EL.13.37.2, +9 more
    fixed: vendor fix RHSA-2006:0665

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

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

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.