What is CVE-2019-12737?

CVE-2019-12737 is a medium-severity vulnerability in Jetbrains Ktor, classified under Use of Password Hash With Insufficient Computational Effort. CVSS score: 5.3/10. Published 2019-10-02.

How severe is CVE-2019-12737?

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

Vulnerability in Jetbrains Ktor

CVE-2019-12737

UserHashedTableAuth in JetBrains Ktor framework before 1.2.0-rc uses a One-Way Hash with a Predictable Salt for storing user credentials.

Published 2019-10-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.5th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.5% 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

Jetbrains Ktor — versions 1.2.0

Weakness classification (CWE)

CWE-916 — Use of Password Hash With Insufficient Computational Effort

References

blog.jetbrains.com/blog/2019/09/26/jetbrains-security-bulletin-q2-2019/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-12737?: CVE-2019-12737 is a medium-severity vulnerability in Jetbrains Ktor, classified under Use of Password Hash With Insufficient Computational Effort. CVSS score: 5.3/10. Published 2019-10-02.
How severe is CVE-2019-12737?: Medium severity. CVSS v3 base score is 5.3 out of 10.