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    CVE-2019-16869

    Netty before 4.1.42.Final mishandles whitespace before the colon in HTTP headers (such as a "Transfer-Encoding : chunked" line), which leads to HTTP request smuggling.

    Published:Sep 26, 2019
    Last Modified:Jul 7, 2025
    EPS:Sep 26, 2019
    EPSS Score:0.01901
    CVSS Score:7.5

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Netty
    Product
    Netty
    Vendor
    Redhat
    Product
    Amq Broker
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Data Grid
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform Cd
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform Eus
    Vendor
    Redhat
    Product
    Jboss Enterprise Bpms Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Brms Platform
    Vendor
    Redhat
    Product
    Jboss Fuse
    Vendor
    Redhat
    Product
    Jboss Single Sign On
    Vendor
    Redhat
    Product
    Openshift Application Runtimes

    Exploits

    https://github.com/netty/netty/issues/9571https://github.com/netty/netty/issues/9571

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-273 HTTP Response Smuggling
    CAPEC-33 HTTP Request Smuggling

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    https://access.redhat.com/errata/RHSA-2019:3892
    https://access.redhat.com/errata/RHSA-2019:3901
    https://access.redhat.com/errata/RHSA-2020:0159
    https://access.redhat.com/errata/RHSA-2020:0160
    https://access.redhat.com/errata/RHSA-2020:0161
    https://access.redhat.com/errata/RHSA-2020:0164
    https://access.redhat.com/errata/RHSA-2020:0445
    https://github.com/netty/netty/compare/netty-4.1.41.Final...netty-4.1.42.Final
    https://github.com/netty/netty/issues/9571
    https://github.com/poc-effectiveness/PoCAdaptation/tree/main/Adapted/CVE-2019-16869/5.0.0.Alpha1/exploit
    https://lists.apache.org/thread.html/0acadfb96176768caac79b404110df62d14d30aa9d53b6dbdb1407ac@%3Cissues.spark.apache.org%3E
    https://lists.apache.org/thread.html/19fed892608db1efe5a5ce14372137669ff639df0205323959af7de3@%3Cdev.olingo.apache.org%3E
    https://lists.apache.org/thread.html/2494a2ac7f66af6e4646a4937b17972a4ec7cd3c7333c66ffd6c639d@%3Cdev.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/2e1cf538b502713c2c42ffa46d81f4688edb5676eb55bd9fc4b4fed7@%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/35961d1ae00849974353a932b4fef12ebce074541552eceefa04f1fd@%3Cdev.olingo.apache.org%3E
    https://lists.apache.org/thread.html/37ed432b8eb35d8bd757f53783ec3e334bd51f514534432bea7f1c3d@%3Cissues.zookeeper.apache.org%3E
    https://lists.apache.org/thread.html/380f6d2730603a2cd6b0a8bea9bcb21a86c199147e77e448c5f7390b@%3Ccommits.zookeeper.apache.org%3E
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    https://lists.apache.org/thread.html/519eb0fd45642dcecd9ff74cb3e71c20a4753f7d82e2f07864b5108f@%3Cdev.drill.apache.org%3E
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    https://lists.debian.org/debian-lts-announce/2019/09/msg00035.html
    https://lists.debian.org/debian-lts-announce/2020/02/msg00018.html
    https://lists.debian.org/debian-lts-announce/2020/09/msg00004.html
    https://seclists.org/bugtraq/2020/Jan/6
    https://usn.ubuntu.com/4532-1/
    https://www.debian.org/security/2020/dsa-4597
    https://access.redhat.com/errata/RHSA-2019:3892
    https://access.redhat.com/errata/RHSA-2019:3901
    https://access.redhat.com/errata/RHSA-2020:0159
    https://access.redhat.com/errata/RHSA-2020:0160
    https://access.redhat.com/errata/RHSA-2020:0161
    https://access.redhat.com/errata/RHSA-2020:0164
    https://access.redhat.com/errata/RHSA-2020:0445
    https://github.com/netty/netty/compare/netty-4.1.41.Final...netty-4.1.42.Final
    https://github.com/netty/netty/issues/9571
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    https://lists.debian.org/debian-lts-announce/2019/09/msg00035.html
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    https://seclists.org/bugtraq/2020/Jan/6
    https://usn.ubuntu.com/4532-1/
    https://www.debian.org/security/2020/dsa-4597

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High