CVE-2007-4990

no score yetEPSS 11%

x.org x font server: no CVSS score yet. EPSS 11% chance of exploitation in the next 30 days.

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.

EPSS: 11% chance of exploitation in the next 30 days; higher than 95% of CVEs (scores of 2026-10-31)
CWE: CWE-189
Published: 2007-10-05
Modified: 2026-06-16
Record from: the NVD, synced 2026-10-19

Affected

x.org:x_font_server

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

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