CVE-2021-21409 vulnerability in Netty and Other Products
Published on March 30, 2021
Possible request smuggling in HTTP/2 due missing validation of content-length
Vulnerability Analysis
CVE-2021-21409 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on 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-2021-21409 has been classified to as a HTTP Request Smuggling vulnerability or weakness.
Products Associated with CVE-2021-21409
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Affected Versions
netty Version < 4.1.61.Final is affected by CVE-2021-21409Vulnerable Packages
The following package name and versions may be associated with CVE-2021-21409
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| maven | io.netty:netty-codec-http2 | < 4.1.61 | 4.1.61 |
Exploit 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.