How severe is CVE-2020-37248?

CVE-2020-37248 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2020-37248 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2020-37248?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2020-37248 have an EU (EUVD) identifier?

Yes. CVE-2020-37248 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-31250.

When was CVE-2020-37248 published?

CVE-2020-37248 was published on 2026-06-08 and last updated on 2026-06-17.

CVE-2020-37248

CVE-2020-37248 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-348.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2020-31250
Weakness: CWE-348
Published: 2026-06-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-37248?: 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.
How severe is CVE-2020-37248?: CVE-2020-37248 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2020-37248 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2020-37248?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2020-37248 have an EU (EUVD) identifier?: Yes. CVE-2020-37248 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2020-31250.
When was CVE-2020-37248 published?: CVE-2020-37248 was published on 2026-06-08 and last updated on 2026-06-17.

References

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