The multibyte support in PostgreSQL 6.5.x with SQL_ASCII encoding consumes an extra character when processing a character that cannot be converted, which could remove an escape character from the query and make the application subject to SQL injection attacks.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This vulnerability has a 1.08% probability of being exploited in the next 30 days, ranking higher than 64% of all scored CVEs.