What is CVE-2020-15954?

CVE-2020-15954 is a medium-severity vulnerability in KDE Kmail, classified under Cleartext Transmission of Sensitive Information. CVSS score: 6.5/10. Published 2020-07-27.

How severe is CVE-2020-15954?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in KDE Kmail

CVE-2020-15954

KDE KMail 19.12.3 (aka 5.13.3) engages in unencrypted POP3 communication during times when the UI indicates that encryption is in use.

Published 2020-07-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

KDE Kmail — versions 19.12.3
Debian Linux — versions 9.0

Weakness classification (CWE)

CWE-319 — Cleartext Transmission of Sensitive Information

References

bugs.kde.org/show_bug.cgi (Vendor Advisory)
lists.debian.org/debian-lts-announce/2020/07/msg00030.html (mailing-list, Third Party Advisory)

Frequently asked questions

What is CVE-2020-15954?: CVE-2020-15954 is a medium-severity vulnerability in KDE Kmail, classified under Cleartext Transmission of Sensitive Information. CVSS score: 6.5/10. Published 2020-07-27.
How severe is CVE-2020-15954?: Medium severity. CVSS v3 base score is 6.5 out of 10.