CVE-2020-5207

MEDIUM

Ktor < 1.3.0 - HTTP Request Smuggling via Header Parsing Inconsistency

Title source: llm
STIX 2.1

Description

In Ktor before 1.3.0, request smuggling is possible when running behind a proxy that doesn't handle Content-Length and Transfer-Encoding properly or doesn't handle \n as a headers separator.

References (2)

Core 2
Core References
Patch, Third Party Advisory x_refsource_misc
https://github.com/ktorio/ktor/pull/1547

Scores

CVSS v3 5.4
EPSS 0.0076
EPSS Percentile 50.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-444
Status published
Products (3)
io.ktor/ktor-client-cio 0 - 1.3.0Maven
io.ktor/ktor-server-cio 0 - 1.3.0Maven
jetbrains/ktor < 1.3.0
Published Jan 27, 2020
Tracked Since Feb 18, 2026