CVE-2021-25762: JetBrains Ktor

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

In JetBrains Ktor before 1.4.3, HTTP Request Smuggling was possible.

Affected products

• JetBrains Ktor: before 1.4.3 (fixed in 1.4.3)

Published 2021-02-03. Last modified 2026-06-17.