CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NCVE-2020-5207
High (7.5) in jetbrains ktor. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in io.ktor:ktor-client-cio 1.3.0.
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.
Severity
- EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
- CWE
- CWE-444
- Published
- Modified
- Record from
- the NVD, synced
Affected
- jetbrains:ktor
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-xrr9-rh8p-433v | Maven | io.ktor:ktor-client-cio | <1.3.0 | 1.3.0 |
| GHSA-xrr9-rh8p-433v | Maven | io.ktor:ktor-server-cio | <1.3.0 | 1.3.0 |