CVE-2020-37248CWE-348

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…

Medium · published June 8, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
7.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00186 · 7.7th percentile
Weakness
CWE-348 · Use of Less Trusted Source
Published
2026-06-08T15:05Z
EPSS history
Timeline
  • 08 JUN 15:05Z
    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…
    cvelistv5