Due to a missing sanitization call in afsql_dd_run_query, syslog-ng before 4.12 are vulnerable to SQL injection from an untrusted source. This is not part of the default configuration, the SQL driver has to be manually configured.
Fixes are in syslog-ng 4.12, syslog-ng Premium Edition 8.2 and syslog-ng Store Box 7.8
Exploitability
AV:AAC:LPR:NUI:NScope
S:UImpact
C:NI:LA:H7.1/CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:HOther