What’s Vulnerable › Vulnerabilities

CVE-2020-37248

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-08 · updated 2026-07-23
• Weakness: CWE-348

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 products

• offlineimap: before 8.0.3 — fixed in 8.0.3

How to fix

Upgrade to a fixed version: offlineimap 8.0.3. Check the vendor advisory for mitigations.

References

• https://github.com/OfflineIMAP/offlineimap/issues/669
• https://github.com/OfflineIMAP/offlineimap3/commit/46505c53ef995455d66c685f9ec3ff6ea93dbb74
• https://github.com/OfflineIMAP/offlineimap3/issues/222
• https://pypi.org/project/offlineimap/#history
• http://www.openwall.com/lists/oss-security/2026/06/08/3

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