HOME VULNERABILITIESCVE-2019-9511

HIGH

CVE-2019-9511

CWE-400Published: August 13, 2019· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service. The attacker requests a large amount of data from a specified resource over multiple streams. They manipulate window size and stream priority to force the server to queue the data in 1-byte chunks. Depending on how efficiently this data is queued, this can consume excess CPU, memory, or both.

Technical Analysis

CVE-2019-9511 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Apache1 product(s)

traffic server

Apple2 product(s)

swiftniomac os x

Canonical1 product(s)

ubuntu linux

Debian1 product(s)

debian linux

f51 product(s)

nginx

Fedora1 product(s)

fedora

mcafee1 product(s)

web gateway

Node.js1 product(s)

node.js

openSUSE1 product(s)

leap

Oracle2 product(s)

graalvmenterprise communications broker

Red Hat6 product(s)

jboss core servicesjboss enterprise application platformopenshift service meshquaysoftware collectionsenterprise linux

synology4 product(s)

skynasdiskstation managervs960hd firmwarevs960hd

Source: NVD CPE · 30 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

PATCHhttps://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2692

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2745

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2746

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2775

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2799

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2925

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2939

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2949

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2955

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2966

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3041

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3932

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3933

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3935

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:4018

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:4019

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:4020

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:4021

ADVISORYhttps://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md

ADVISORYhttps://kb.cert.org/vuls/id/605641/

ADVISORYhttps://kc.mcafee.com/corporate/index?page=content&id=SB10296

ADVISORYhttps://seclists.org/bugtraq/2019/Aug/40

ADVISORYhttps://seclists.org/bugtraq/2019/Sep/1

ADVISORYhttps://security.netapp.com/advisory/ntap-20190823-0002/

ADVISORYhttps://security.netapp.com/advisory/ntap-20190823-0005/

ADVISORYhttps://support.f5.com/csp/article/K02591030

ADVISORYhttps://usn.ubuntu.com/4099-1/

ADVISORYhttps://www.debian.org/security/2019/dsa-4505

ADVISORYhttps://www.debian.org/security/2019/dsa-4511

ADVISORYhttps://www.debian.org/security/2020/dsa-4669

ADVISORYhttps://www.oracle.com/security-alerts/cpujan2021.html

ADVISORYhttps://www.oracle.com/security-alerts/cpuoct2020.html

ADVISORYhttps://www.synology.com/security/advisory/Synology_SA_19_33

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.html

ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.html

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2692

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2745

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2746

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2775

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2799

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2925

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2939

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2949

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2955

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:2966

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3041

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3932

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3933

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:3935

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:4018

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:4019

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:4020

ADVISORYhttps://access.redhat.com/errata/RHSA-2019:4021

ADVISORYhttps://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-002.md

ADVISORYhttps://kb.cert.org/vuls/id/605641/

ADVISORYhttps://kc.mcafee.com/corporate/index?page=content&id=SB10296

ADVISORYhttps://seclists.org/bugtraq/2019/Aug/40

ADVISORYhttps://seclists.org/bugtraq/2019/Sep/1

ADVISORYhttps://security.netapp.com/advisory/ntap-20190823-0002/

ADVISORYhttps://security.netapp.com/advisory/ntap-20190823-0005/

ADVISORYhttps://support.f5.com/csp/article/K02591030

ADVISORYhttps://usn.ubuntu.com/4099-1/

ADVISORYhttps://www.debian.org/security/2019/dsa-4505

ADVISORYhttps://www.debian.org/security/2019/dsa-4511

ADVISORYhttps://www.debian.org/security/2020/dsa-4669

ADVISORYhttps://www.oracle.com/security-alerts/cpujan2021.html

ADVISORYhttps://www.oracle.com/security-alerts/cpuoct2020.html

ADVISORYhttps://www.synology.com/security/advisory/Synology_SA_19_33

All References (94)

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00031.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00032.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00003.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00005.htmlMailing List · Third Party Advisory

→

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00014.htmlMailing List · Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2692Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2745Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2746Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2775Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2799Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2925Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2939Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2949Third Party Advisory

→

https://access.redhat.com/errata/RHSA-2019:2955Third Party Advisory

Quick Facts

CVE IDCVE-2019-9511

CVSS Score7.5 / 10

SeverityHIGH

WeaknessCWE-400

CISA KEVNo

Affected12 vendor(s)

PublishedAug 13, 2019

Related CVEs (CWE-400)

CVE-2017-1000378

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2019-9511 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.

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