OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to…
Priority LOW 28CWE-348Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00186 8th percentileScored 2026-11-07
Fix Fixed OfflineIMAP (OfflineIMAP): 8.0.3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| offlineimap | OfflineIMAP | before 8.0.3 | 8.0.3 | Patch available | CNA |
- OfflineIMAP Vendorofflineimap Affected before 8.0.3 Fixed in 8.0.3 Patch available CNA
Remediation
- Fix · CNA OfflineIMAP (OfflineIMAP) Fixed in 8.0.3
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-37248
- 2026-10-03 Alias added: GHSA-899r-9fxv-q4xm
References
More offlineimap vulnerabilities
- TI-2010-04263 Improper certificate validation in offlineimap CVSS 3.1CRITICAL 9.8
- TI-2010-04262 Improper certificate validation in offlineimap CVSS 3.1MEDIUM 5.9
Sources
- CVE-2020-37248 · CVE Program
- CVE-2020-37248 · NVD
- FIRST EPSS
- GHSA-899r-9fxv-q4xm · GitHub Advisory Database · CC BY 4.0
- CVE-2020-37248 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences