gnuserv before 3.12, as shipped with XEmacs, does not properly check the specified length of an X Windows MIT-MAGIC-COOKIE cookie, which allows remote attackers to execute arbitrary commands via a buffer overflow, or brute force authentication by using a short cookie length.
http://archives.neohapsis.com/archives/bugtraq/2001-02/0030.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/6056
Published: 2001-05-03
Base Score: 10
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
Severity: Critical