CVE-2020-37248 PUBLISHED

Assigner: mitre
Reserved: 08.06.2026 Published: 08.06.2026 Updated: 08.06.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	OfflineIMAP
Product	OfflineIMAP
Versions	Default: unaffected affected from 0 to 8.0.3 (excl.)

References

https://github.com/OfflineIMAP/offlineimap3/commit/46505c53ef995455d66c685f9ec3ff6ea93dbb74
https://github.com/OfflineIMAP/offlineimap3/issues/222
https://github.com/OfflineIMAP/offlineimap/issues/669
https://pypi.org/project/offlineimap/#history

Problem Types

CWE-348 Use of Less Trusted Source CWE