CVE-2008-1377: X x11

High severity, CVSS 9.0. EPSS: 2.7% chance of exploitation in the next 30 days.

The (1) SProcRecordCreateContext and (2) SProcRecordRegisterClients functions in the Record extension and the (3) SProcSecurityGenerateAuthorization function in the Security extension in the X server 1.4 in X.Org X11R7.3 allow context-dependent attackers to execute arbitrary code via requests with crafted length values that specify an arbitrary number of bytes to be swapped on the heap, which triggers heap corruption.

Affected products

• X x11: version r7.3 only

Published 2008-06-16. Last modified 2026-06-16.