CVE-2019-9511CWE-400

Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service

High · published August 13, 2019

Patch now

High probability of exploitation

CVSS calls it high at 7.5. It sits in the 99.1th percentile for exploit probability.

CVSS v3.0
7.5
EPSS
60%
Percentile
99.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.0
7.5 · HIGH
Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.59547 · 99.1th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2019-08-13T20:50Z
EPSS history
Timeline
  • 13 AUG 20:50Z
    Some HTTP/2 implementations are vulnerable to window size manipulation and stream prioritization manipulation, potentially leading to a denial of service
    cvelistv5