In postfix-mta-sts-resolver before 0.5.1, All users can receive incorrect response from daemon under rare conditions, rendering downgrade of effective STS policy.
Exploitability
AV:LAC:HPR:HUI:RScope
S:CImpact
C:HI:HA:N6.9/CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:NOther