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CVE-2020-5207— Request smuggling is possible in Ktor when both chunked TE and content length specified

Quick assessment

Affected
Ktor.io Ktor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jetbrains Ktor 1.3.0之前版本中存在环境问题漏洞。该漏洞源于网络系统或产品的环境因素不合理。

CVSS 5.4 · Medium EPSS 0.76% · P54

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-5207

Vulnerability Information
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Vulnerability Title
Request smuggling is possible in Ktor when both chunked TE and content length specified
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP请求的解释不一致性(HTTP请求私运)
Source: CVE Program / CVE List V5
Vulnerability Title
Jetbrains Ktor 环境问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jetbrains Ktor 1.3.0之前版本中存在环境问题漏洞。该漏洞源于网络系统或产品的环境因素不合理。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Ktor.io Ktor < 1.3.0 -

II. Public POCs for CVE-2020-5207

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2020-5207

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Patches & Fixes for CVE-2020-5207 (1)

Vendor Advisories for CVE-2020-5207 (1)

IV. Related Vulnerabilities

Same product: Ktor
Same weakness: CWE-444

V. Comments for CVE-2020-5207

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