Medium (6.5). EPSS 0.2% chance of exploitation in the next 30 days.
OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS/man-in-the-middle attacks, taking over the connection and extracting account credentials in cleartext.
Severity
CVSS 3.1
6.5 medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
EPSS
0.2% chance of exploitation in the next 30 days; higher than 8% of CVEs (scores of 2026-10-31)