CVE-2020-37248

Startup TLS Trust Issue Enables Credential Disclosure

Published Jun 8, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Startup TLS Trust Issue Enables Credential Disclosure
Type Values Removed Values Added
Description 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.
First Time appeared Offlineimap
Offlineimap offlineimap
Weaknesses CWE-348
CPEs cpe:2.3:a:offlineimap:offlineimap:*:*:*:*:*:*:*:*
Vendors & Products Offlineimap
Offlineimap offlineimap
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jun 8, 2026, 6:49 PM
Reserved
Jun 8, 2026, 3:05 PM
Status
Deferred
Published
Jun 8, 2026, 4:16 PM
Modified
Jul 23, 2026, 7:10 AM