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CVE-2018-21035

Published: 28 February 2020

In Qt through 5.14.1, the WebSocket implementation accepts up to 2GB for frames and 2GB for messages. Smaller limits cannot be configured. This makes it easier for attackers to cause a denial of service (memory consumption).

Notes

AuthorNote
mdeslaur
upstream commit just adds new settings allowing users to lower
allowed frame/message size, it doesn't change the default
behaviour

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
qtwebsockets-opensource-src
Launchpad, Ubuntu, Debian
hirsute Not vulnerable
(5.15.1-2)
groovy Ignored
(end of life)
xenial Needs triage

bionic Needs triage

eoan Ignored
(end of life)
focal Needs triage

impish Not vulnerable
(5.15.1-2)
jammy Not vulnerable
(5.15.1-2)
kinetic Not vulnerable
(5.15.1-2)
lunar Not vulnerable
(5.15.1-2)
trusty Does not exist

upstream Needs triage

mantic Not vulnerable
(5.15.1-2)
Patches:
upstream: https://github.com/qt/qtwebsockets/commit/ed93680f34e92ad0383aa4e610bb65689118ca93

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H