What is CVE-2019-8337?

CVE-2019-8337 is a medium-severity vulnerability in Marlam Mpop, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2019-02-13.

How severe is CVE-2019-8337?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Marlam Mpop

CVE-2019-8337

In msmtp 1.8.2 and mpop 1.4.3, when tls_trust_file has its default configuration, certificate-verification results are not properly checked.

Vulnerability class: Improper Certificate Validation

Published 2019-02-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.9th percentile), scored 2026-10-06.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Marlam Mpop — versions 1.4.2
Marlam Msmtp — versions 1.8.2

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

marlam.de/mpop/news/mpop-1-4-3/ (Patch, Third Party Advisory)
marlam.de/msmtp/news/ (Patch, Vendor Advisory)
gitlab.marlam.de/marlam/mpop/commit/b51a6c6b8b83bf0913cc52fa2ff64307e987a5b8 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-8337?: CVE-2019-8337 is a medium-severity vulnerability in Marlam Mpop, classified under Improper Certificate Validation. CVSS score: 5.3/10. Published 2019-02-13.
How severe is CVE-2019-8337?: Medium severity. CVSS v3 base score is 5.3 out of 10.