What is CVE-2021-43203?

CVE-2021-43203 is a high-severity vulnerability in Jetbrains Ktor, classified under Improper Authentication. CVSS score: 7.5/10. Published 2021-11-09.

How severe is CVE-2021-43203?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Jetbrains Ktor

CVE-2021-43203

In JetBrains Ktor before 1.6.4, nonce verification during the OAuth2 authentication process is implemented improperly.

Vulnerability class: Broken Authentication

EPSS: 0.008 (53.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Jetbrains Ktor
N/a — versions n/a

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-43203?: CVE-2021-43203 is a high-severity vulnerability in Jetbrains Ktor, classified under Improper Authentication. CVSS score: 7.5/10. Published 2021-11-09.
How severe is CVE-2021-43203?: High severity. CVSS v3 base score is 7.5 out of 10.