What is CVE-2019-12736?

CVE-2019-12736 is a critical-severity vulnerability in Jetbrains Ktor, classified under Command Injection. CVSS score: 9.8/10. Published 2019-10-02.

How severe is CVE-2019-12736?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Jetbrains Ktor

CVE-2019-12736

JetBrains Ktor framework before 1.2.0-rc does not sanitize the username provided by the user for the LDAP protocol, leading to command injection.

Vulnerability class: Command Injection (OS Command Injection)

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.022 (82.4th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Jetbrains Ktor

Weakness classification (CWE)

CWE-77 — Command Injection

References

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

Frequently asked questions

What is CVE-2019-12736?: CVE-2019-12736 is a critical-severity vulnerability in Jetbrains Ktor, classified under Command Injection. CVSS score: 9.8/10. Published 2019-10-02.
How severe is CVE-2019-12736?: Critical severity. CVSS v3 base score is 9.8 out of 10.