Bugzilla 2.16.10, 2.17 through 2.18.4, and 2.20 does not properly handle certain characters in the mostfreqthreshold parameter in duplicates.cgi, which allows remote attackers to trigger a SQL error.
References to Advisories, Solutions, and Tools
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Advisory; Patch Information; Exploit
20060221 [BUGZILLA] Security Advisory for Bugzilla 2.20, 2.21.1, and 2.18.4