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Critical DSA-4885-1 7 CVEs

netty - security update

Published Apr 5, 2021 · Updated Mar 9, 2026

Fixed packages 1

ReleasePackageFixed in
Debian · 10 netty 1:4.1.33-1+deb10u2

Vulnerabilities 7

  • Critical 9.1

    HTTP Request Smuggling in Netty

    HttpObjectDecoder.java in Netty before 4.1.44 allows an HTTP header that lacks a colon, which might be interpreted as a separate header with an incorrect syntax, or might be interpreted as an "invalid fold."

  • High 7.5

    Denial of Service in Netty

    The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to …

  • High 7.5

    HTTP Request Smuggling in Netty

    Netty 4.1.43.Final allows HTTP Request Smuggling because it mishandles Transfer-Encoding whitespace (such as a [space]Transfer-Encoding:chunked line) and a later Content-Length header. This issue exists because of an incomplete fix for CVE-2019-16869.

  • Medium 6.2

    Local Information Disclosure Vulnerability in Netty on Unix-Like systems due temporary files

    Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty before version 4.1.59.Final there is a vulnerability on Unix-like systems involving an…

  • Medium 5.9
    CVE-2021-21295 EPSS 19%

    Possible request smuggling in HTTP/2 due missing validation

    Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.60.Final there is a vulnerability that…

  • Medium 5.9

    Possible request smuggling in HTTP/2 due missing validation of content-length

    Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.61.Final there is a vulnerability that…

  • Medium —
    CVE-2019-20445 EPSS 14%

    HTTP Request Smuggling in Netty

    HttpObjectDecoder.java in Netty before 4.1.44 allows a Content-Length header to be accompanied by a second Content-Length header, or by a Transfer-Encoding header.