CVE-2019-9511

highpriority · attend · 61EPSS 0.595 · 99 %ileexploit · PoCDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

2 exploits · PoC

Likely / severe?

59.5% (99th) EPSS

CVSS 7.8 · high

Is it mine?

95 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-22

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · cret@cert.org USexploitability 3.9 · impact 3.6

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USprimaryCWE-400USCWE-400US

exploits (2)

Public proof-of-concept and weaponised exploit code.

affected products (95)

Products and version ranges known to be affected.

Red Hat Enterprise Linux 7all versionscert_bundDEcpe:/o:redhat:enterprise_linux:7
Red Hat JBoss Enterprise Application Platform <7.1.7all versionscert_bundDE
Red Hat JBoss Enterprise Application Platform <7.3.11all versionscert_bundDE
Red Hat JBoss Enterprise Application Platform< 7.1.7cert_bundDE
Red Hat JBoss Enterprise Application Platform< 7.3.11cert_bundDE
n/a n/a≤ n/aenisa_euvdEU
Apache Software Foundation Traffic Server6.0.0 → 6.2.3fstec_bduRU
Apache Software Foundation Traffic Server7.0.0 → 7.1.6fstec_bduRU
Apache Software Foundation Traffic Server8.0.0 → 8.0.3fstec_bduRU
Canonical Ltd. Ubuntu≤ 19.04fstec_bduRU
Canonical Ltd. Ubuntu≤ 16.04 LTSfstec_bduRU
Canonical Ltd. Ubuntu≤ 18.04 LTSfstec_bduRU
Fedora Project Fedora≤ 30fstec_bduRU
Fedora Project Fedora≤ 29fstec_bduRU
Microsoft Corp Windows 10all versionsfstec_bduRU
Microsoft Corp Windows 10 1607all versionsfstec_bduRU
Microsoft Corp Windows 10 1703all versionsfstec_bduRU
Microsoft Corp Windows 10 1709all versionsfstec_bduRU
Microsoft Corp Windows 10 1803all versionsfstec_bduRU
Microsoft Corp Windows 10 1809all versionsfstec_bduRU

showing 20 of 95

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-1050nginx: Mehrere Schwachstellen ermöglichen Denial of ServiceDeutsch2019-08-14csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in nginx ausnutzen, um einen Denial of Service Angriff durchzuführen.
WID-SEC-W-2024-1926Red Hat JBoss Enterprise Application Platform: Mehrere SchwachstellenDeutsch2024-08-26csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Red Hat JBoss Enterprise Application Platform auf Red Hat Enterprise Linux ausnutzen, um beliebigen Programmcode auszuführen, einen Denial-of-Service-Zustand zu erzeugen, vertrauliche Informationen preiszugeben, Dateien und Daten zu manipulieren oder Sicherheitsmaßnahmen zu umgehen.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2019-08-13modified 2026-06-17

related (3,230)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2025-53521US	—OT critical	2.30% (83rd)	KEV	2025-10-15
When a BIG-IP APM access policy is configured on a virtual server, specific malicious traffic can lead to Remote Code Execution (RCE). Note: Software versions which have reached…
CVE-2022-22963US	critical9.8OT critical	99.9% (100th)	KEV	2022-04-01
In Spring Cloud Function versions 3.1.6, 3.2.2 and older unsupported versions, when using routing functionality it is possible for a user to provide a specially crafted SpEL as a r…
CVE-2020-3569US	high8.6OT critical	3.32% (89th)	KEV	2020-09-23
Multiple vulnerabilities in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to either immedi…
CVE-2020-3566US	high8.6OT critical	3.70% (90th)	KEV	2020-08-29
A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to exhaust process memory…
CVE-2023-50387US	high7.5	100.0% (100th)	Exploit	2024-02-14
Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more D…

+3225 more

references (191)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan