|Date: (C)2011-01-14 (M)2017-08-18|
|CVSS Score: 4.0||Access Vector: NETWORK|
|Exploitability Subscore: 8.0||Access Complexity: LOW|
|Impact Subscore: 2.9||Authentication: SINGLE_INSTANCE|
| ||Confidentiality: NONE|
| ||Integrity: NONE|
| ||Availability: PARTIAL|
MySQL 5.1 before 5.1.51 and 5.5 before 5.5.6 allows remote authenticated users to cause a denial of service (mysqld server crash) by performing a user-variable assignment in a logical expression that is calculated and stored in a temporary table for GROUP BY, then causing the expression value to be used after the table is created, which causes the expression to be re-evaluated instead of accessing its value from the table.