CVE-2020-37248

EUVD-2020-31250
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
6.5 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 5%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
offlineimapofflineimap
𝑥
< 8.0.3
CNA
Debian logo
Debian Releases
Debian Product
Codename
offlineimap3
bookworm
vulnerable
bullseye
vulnerable
sid
vulnerable
trixie
vulnerable
Common Weakness Enumeration
References
https://github.com/OfflineIMAP/offlineimap/issues/669
https://github.com/OfflineIMAP/offlineimap3/commit/46505c53ef995455d66c685f9ec3ff6ea93dbb74
https://github.com/OfflineIMAP/offlineimap3/issues/222
https://pypi.org/project/offlineimap/#history
http://www.openwall.com/lists/oss-security/2026/06/08/3