CVE-2020-5207 is a vulnerability in JetBrains Ktor
Published on January 27, 2020
Request smuggling is possible in Ktor when both chunked TE and content length specified
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.
Vulnerability Analysis
CVE-2020-5207 can be exploited with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a HTTP Request Smuggling Vulnerability?
When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to "smuggle" a request to one device without the other device being aware of it.
CVE-2020-5207 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2020-5207
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Affected Versions
Ktor.io Ktor Version < 1.3.0 is affected by CVE-2020-5207Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.