OfflineIMAP up to 8.0.2 STARTTLS less trusted source

CVSS Meta Temp Score
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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability was found in OfflineIMAP up to 8.0.2 and classified as problematic. This affects an unknown function of the component STARTTLS Handler. Such manipulation leads to less trusted source. This vulnerability is uniquely identified as CVE-2020-37248. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OfflineIMAP up to 8.0.2 and classified as problematic. Affected by this issue is an unknown code of the component STARTTLS Handler. The manipulation with an unknown input leads to a less trusted source vulnerability. Using CWE to declare the problem leads to CWE-348. The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack. Impacted is integrity. CVE summarizes:

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 advisory is shared for download at github.com. This vulnerability is handled as CVE-2020-37248 since 06/08/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 319693 (Linux Distros Unpatched Vulnerability : CVE-2020-37248), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 8.0.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (319693). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (MITRE): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Less trusted source
CWE: CWE-348
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 319693
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2020-37248

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OfflineIMAP 8.0.3

Timelineinfo

06/08/2026 Advisory disclosed
06/08/2026 +0 days CVE reserved
06/08/2026 +0 days VulDB entry created
06/09/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: 46505c53ef995455d66c685f9ec3ff6ea93dbb74
Status: Confirmed

CVE: CVE-2020-37248 (🔒)
GCVE (CVE): GCVE-0-2020-37248
GCVE (VulDB): GCVE-100-369212

Entryinfo

Created: 06/08/2026 17:50
Updated: 06/09/2026 01:39
Changes: 06/08/2026 17:50 (63), 06/09/2026 01:39 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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