CVE-2007-4990

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 10.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2007-10-05 · updated 2026-06-16
Weakness: CWE-189

Description

The swap_char2b function in X.Org X Font Server (xfs) before 1.0.5 allows context-dependent attackers to execute arbitrary code via (1) QueryXBitmaps and (2) QueryXExtents protocol requests with crafted size values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption.

Affected products

X.Org X Font Server: through 1.0.4

References

http://bugs.freedesktop.org/show_bug.cgi?id=12299
http://bugs.gentoo.org/show_bug.cgi?id=194606
http://docs.info.apple.com/article.html?artnum=307562
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01323725
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=602
http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html
http://lists.freedesktop.org/archives/xorg-announce/2007-October/000416.html
http://secunia.com/advisories/27040
http://secunia.com/advisories/27052
http://secunia.com/advisories/27060
http://secunia.com/advisories/27176
http://secunia.com/advisories/27228

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