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    CVE-2019-9517

    Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.

    Published:Aug 13, 2019
    Last Modified:Jan 14, 2025
    EPS:Aug 13, 2019
    EPSS Score:0.04499
    CVSS Score:7.5

    Affected Products

    Vendor
    Apache
    Product
    Http Server
    Vendor
    Apache
    Product
    Traffic Server
    Vendor
    Apple
    Product
    Mac Os X
    Vendor
    Apple
    Product
    Swiftnio
    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Mcafee
    Product
    Web Gateway
    Vendor
    Netapp
    Product
    Clustered Data Ontap
    Vendor
    Nodejs
    Product
    Node.js
    Vendor
    Opensuse
    Product
    Leap
    Vendor
    Oracle
    Product
    Communications Element Manager
    Vendor
    Oracle
    Product
    Graalvm
    Vendor
    Oracle
    Product
    Instantis Enterprisetrack
    Vendor
    Oracle
    Product
    Retail Xstore Point Of Service
    Vendor
    Redhat
    Product
    Amq Broker
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Core Services
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform
    Vendor
    Redhat
    Product
    Jboss Fuse
    Vendor
    Redhat
    Product
    Openshift Service Mesh
    Vendor
    Redhat
    Product
    Quay
    Vendor
    Redhat
    Product
    Rhel Software Collections
    Vendor
    Redhat
    Product
    Software Collections
    Vendor
    Synology
    Product
    Diskstation Manager
    Vendor
    Synology
    Product
    Skynas
    Vendor
    Synology
    Product
    Vs960hd
    Vendor
    Synology
    Product
    Vs960hd Firmware

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-48913 (CVSS 7.3) — Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. …
    CVE-2026-42536 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted…
    CVE-2026-44185 (CVSS 7.3) — Buffer Over-read vulnerability in Apache HTTP Server via outbound OCSP requests to an attacker controlled OCSP…
    CVE-2026-34355 (CVSS 7.5) — A buffer overflow in mod_proxy_html in Apache HTTP Server 2.4.67 and earlier allows an attack by an untrusted …
    CVE-2026-44631 (CVSS 9.8) — Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. Th…
    CVE-2026-44119 (CVSS 5.5) — Improper Privilege Management vulnerability in Apache HTTP Server 2.4.67 and earlier allows local .htaccess au…
    CVE-2026-43951 (CVSS 6.5) — Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response lan…
    CVE-2026-42535 (CVSS 9.1) — A path handling issue in mod_dav_fs in Apache 2.4.67 and earlier allows a WebDAV content author to directly ma…
    CVE-2026-34356 (CVSS 7.5) — Heap-based Buffer Overflow vulnerability in Apache HTTP Server with malicious backend servers and ProxyPassRev…
    CVE-2026-44186 (CVSS 7.3) — Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in the mod_proxy_ftp module in Apache HTT…

    References

    http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00004.html
    http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
    http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
    http://www.openwall.com/lists/oss-security/2019/08/15/7
    https://access.redhat.com/errata/RHSA-2019:2893
    https://access.redhat.com/errata/RHSA-2019:2925
    https://access.redhat.com/errata/RHSA-2019:2939
    https://access.redhat.com/errata/RHSA-2019:2946
    https://access.redhat.com/errata/RHSA-2019:2949
    https://access.redhat.com/errata/RHSA-2019:2950
    https://access.redhat.com/errata/RHSA-2019:2955
    https://access.redhat.com/errata/RHSA-2019:3932
    https://access.redhat.com/errata/RHSA-2019:3933
    https://access.redhat.com/errata/RHSA-2019:3935
    https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
    https://kb.cert.org/vuls/id/605641/
    https://kc.mcafee.com/corporate/index?page=content&id=SB10296
    https://lists.apache.org/thread.html/4610762456644181b267c846423b3a990bd4aaea1886ecc7d51febdb%40%3Cannounce.httpd.apache.org%3E
    https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/d89f999e26dfb1d50f247ead1fe8538014eb412b2dbe5be4b1a9ef50%40%3Cdev.httpd.apache.org%3E
    https://lists.apache.org/thread.html/ec97fdfc1a859266e56fef084353a34e0a0b08901b3c1aa317a43c8c%40%3Cdev.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r03ee478b3dda3e381fd6189366fa7af97c980d2f602846eef935277d%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rd2fb621142e7fa187cfe12d7137bf66e7234abcbbcd800074c84a538%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/
    https://seclists.org/bugtraq/2019/Aug/47
    https://security.gentoo.org/glsa/201909-04
    https://security.netapp.com/advisory/ntap-20190823-0003/
    https://security.netapp.com/advisory/ntap-20190823-0005/
    https://security.netapp.com/advisory/ntap-20190905-0003/
    https://support.f5.com/csp/article/K02591030
    https://support.f5.com/csp/article/K02591030?utm_source=f5support&amp%3Butm_medium=RSS
    https://usn.ubuntu.com/4113-1/
    https://www.debian.org/security/2019/dsa-4509
    https://www.oracle.com/security-alerts/cpuapr2020.html
    https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
    https://www.synology.com/security/advisory/Synology_SA_19_33
    http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00004.html
    http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html
    http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html
    http://www.openwall.com/lists/oss-security/2019/08/15/7
    https://access.redhat.com/errata/RHSA-2019:2893
    https://access.redhat.com/errata/RHSA-2019:2925
    https://access.redhat.com/errata/RHSA-2019:2939
    https://access.redhat.com/errata/RHSA-2019:2946
    https://access.redhat.com/errata/RHSA-2019:2949
    https://access.redhat.com/errata/RHSA-2019:2950
    https://access.redhat.com/errata/RHSA-2019:2955
    https://access.redhat.com/errata/RHSA-2019:3932
    https://access.redhat.com/errata/RHSA-2019:3933
    https://access.redhat.com/errata/RHSA-2019:3935
    https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md
    https://kb.cert.org/vuls/id/605641/
    https://kc.mcafee.com/corporate/index?page=content&id=SB10296
    https://lists.apache.org/thread.html/4610762456644181b267c846423b3a990bd4aaea1886ecc7d51febdb%40%3Cannounce.httpd.apache.org%3E
    https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/d89f999e26dfb1d50f247ead1fe8538014eb412b2dbe5be4b1a9ef50%40%3Cdev.httpd.apache.org%3E
    https://lists.apache.org/thread.html/ec97fdfc1a859266e56fef084353a34e0a0b08901b3c1aa317a43c8c%40%3Cdev.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r03ee478b3dda3e381fd6189366fa7af97c980d2f602846eef935277d%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rd2fb621142e7fa187cfe12d7137bf66e7234abcbbcd800074c84a538%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E
    https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZQGHE3WTYLYAYJEIDJVF2FIGQTAYPMC/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BP556LEG3WENHZI5TAQ6ZEBFTJB4E2IS/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CMNFX5MNYRWWIMO4BTKYQCGUDMHO3AXP/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XHTKU7YQ5EEP2XNSAV4M4VJ7QCBOJMOD/
    https://seclists.org/bugtraq/2019/Aug/47
    https://security.gentoo.org/glsa/201909-04
    https://security.netapp.com/advisory/ntap-20190823-0003/
    https://security.netapp.com/advisory/ntap-20190823-0005/
    https://security.netapp.com/advisory/ntap-20190905-0003/
    https://support.f5.com/csp/article/K02591030
    https://support.f5.com/csp/article/K02591030?utm_source=f5support&amp%3Butm_medium=RSS
    https://usn.ubuntu.com/4113-1/
    https://www.debian.org/security/2019/dsa-4509
    https://www.oracle.com/security-alerts/cpuapr2020.html
    https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html
    https://www.synology.com/security/advisory/Synology_SA_19_33

    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