CVE-2020-37248: Offlineimap

Medium severity, CVSS 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.

Affected products

• Offlineimap Offlineimap: before 8.0.3 (fixed in 8.0.3)

Published 2026-06-08. Last modified 2026-07-23.