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    CVE-2016-9589

    Undertow in Red Hat wildfly before version 11.0.0.Beta1 is vulnerable to a resource exhaustion resulting in a denial of service. Undertow keeps a cache of seen HTTP headers in persistent connections. It was found that this cache can easily exploited to fill memory with garbage, up to "max-headers" (default 200) * "max-header-size" (default 1MB) per active TCP connection.

    Published:Mar 22, 2017
    Last Modified:Nov 21, 2024
    EPS:Mar 12, 2018
    EPSS Score:0.03086
    CVSS Score:7.5

    Affected Products

    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform
    Vendor
    Redhat
    Product
    Jboss Single Sign On
    Vendor
    Redhat
    Product
    Jboss Wildfly Application Server
    Vendor
    Redhat
    Product
    Red Hat Single Sign On

    Exploits

    https://github.com/dawetmaster/CVE-2016-9589-undertow-vulnerable

    Related CVEs

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    CVE-2026-17615 (CVSS 7.5) — A flaw was found in RESTEasy's SourceProvider. This vulnerability allows an unauthenticated attacker to perfor…
    CVE-2026-5680 (CVSS 7.5) — A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted …
    CVE-2026-81624 (CVSS 7.5) — Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow h…
    CVE-2026-19611 (CVSS 7.4) — A flaw was found in WildFly Elytron. Password hashing and verification normalize input with Unicode NFKC, whic…
    CVE-2026-76166 (CVSS 4.3) — A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted U…
    CVE-2026-19879 (CVSS 5.3) — A flaw was found in Undertow, an HTTP server, within its HTTP response header writing path. The `writeString()…
    CVE-2026-14180 (CVSS 5.3) — A flaw was found in the ChunkReader component of the Undertow HTTP server, which is used by WildFly and JBoss …
    CVE-2026-15565 (CVSS 7.5) — A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authent…
    CVE-2026-15567 (CVSS 7.5) — A flaw was found in Wildfly. A remote unauthenticated attacker can trigger OutOfMemoryError as CSIv2Util's GSS…

    References

    http://rhn.redhat.com/errata/RHSA-2017-0830.html
    http://rhn.redhat.com/errata/RHSA-2017-0831.html
    http://rhn.redhat.com/errata/RHSA-2017-0832.html
    http://rhn.redhat.com/errata/RHSA-2017-0834.html
    http://rhn.redhat.com/errata/RHSA-2017-0876.html
    http://www.securityfocus.com/bid/97060
    https://access.redhat.com/errata/RHSA-2017:0872
    https://access.redhat.com/errata/RHSA-2017:0873
    https://access.redhat.com/errata/RHSA-2017:3454
    https://access.redhat.com/errata/RHSA-2017:3455
    https://access.redhat.com/errata/RHSA-2017:3456
    https://access.redhat.com/errata/RHSA-2017:3458
    https://bugzilla.redhat.com/show_bug.cgi?id=1404782
    http://rhn.redhat.com/errata/RHSA-2017-0830.html
    http://rhn.redhat.com/errata/RHSA-2017-0831.html
    http://rhn.redhat.com/errata/RHSA-2017-0832.html
    http://rhn.redhat.com/errata/RHSA-2017-0834.html
    http://rhn.redhat.com/errata/RHSA-2017-0876.html
    http://www.securityfocus.com/bid/97060
    https://access.redhat.com/errata/RHSA-2017:0872
    https://access.redhat.com/errata/RHSA-2017:0873
    https://access.redhat.com/errata/RHSA-2017:3454
    https://access.redhat.com/errata/RHSA-2017:3455
    https://access.redhat.com/errata/RHSA-2017:3456
    https://access.redhat.com/errata/RHSA-2017:3458
    https://bugzilla.redhat.com/show_bug.cgi?id=1404782

    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