Vulnerability Details : CVE-2019-9511

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.
Published 2019-08-13 21:15:12
Updated 2025-01-14 19:29:56
Source CERT/CC
View at NVD,   CVE.org
Vulnerability category: Denial of service

Products affected by CVE-2019-9511

Threat overview for CVE-2019-9511

Top countries where our scanners detected CVE-2019-9511
Top open port discovered on systems with this issue 80
IPs affected by CVE-2019-9511 1,371,686
Threat actors abusing to this issue? Yes
Find out if you* are affected by CVE-2019-9511!
*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2019-9511

EPSS FAQ
27.04%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 97 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-9511

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
7.8
 HIGH AV:N/AC:L/Au:N/C:N/I:N/A:C
10.0
6.9
 NIST
7.5
 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
 CERT/CC
7.5
 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
 NIST

CWE ids for CVE-2019-9511

  • The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
    Assigned by: cret@cert.org (Secondary)
  • The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-9511

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