Vulnerability · Published Jun 8, 2026 · Assigned by mitre
CVE-2020-37248
Medium 6.5
In plain English
A medium-severity security flaw in OfflineIMAP from OfflineIMAP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.2%top 91.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | offlineimap3 | no fix listed | DEBIAN-CVE-2020-37248 |
| Debian:13 | offlineimap3 | no fix listed | DEBIAN-CVE-2020-37248 |
| Debian:14 | offlineimap3 | 8.0.3+dfsg-1 | DEBIAN-CVE-2020-37248 |
| Ubuntu:22.04:LTS | offlineimap3 | no fix listed | UBUNTU-CVE-2020-37248 |
| Ubuntu:24.04:LTS | offlineimap3 | no fix listed | UBUNTU-CVE-2020-37248 |
| Ubuntu:25.10 | offlineimap3 | no fix listed | UBUNTU-CVE-2020-37248 |
| Ubuntu:26.04:LTS | offlineimap3 | no fix listed | UBUNTU-CVE-2020-37248 |
| Ubuntu:26.10 | offlineimap3 | no fix listed | UBUNTU-CVE-2020-37248 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OfflineIMAP | OfflineIMAP | 0 – before 8.0.3 |
Weakness: CWE-348 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N