CVE-2020-5207: jetbrains ktor HTTP Request/Response Smuggling

Vulnerability summary

CVE-2020-5207 is a high (CVSS 7.5) HTTP Request/Response Smuggling vulnerability in jetbrains ktor. EPSS estimates a 0.76% chance of exploitation in the next 30 days, higher than 54.5% of scored vulnerabilities.

Timeline

1. 27-01-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.