openwall.com
http://www.openwall.com/lists/oss-security/2026/06/08/3 CVE-2020-37248
MEDIUM
OfflineIMAP STARTTLS Stripping Vulnerability
Record summary
CVE-2020-37248 has a selected CVSS score of 6.5 (medium).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Jun 8, 2026 · Source: CVE List
Affected products and versions
1| Product | Source | Version range | Status |
|---|---|---|---|
OfflineIMAPBrowse OfflineIMAP / OfflineIMAPDefault status: unaffected | CVE List | Before 8.0.3 | affected |
References
6github.com
https://github.com/OfflineIMAP/offlineimap/issues/669 github.com
https://github.com/OfflineIMAP/offlineimap3/commit/46505c53ef995455d66c685f9ec3ff6ea93dbb74 github.com
https://github.com/OfflineIMAP/offlineimap3/issues/222 nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2020-37248 pypi.org
https://pypi.org/project/offlineimap