High severity · published Feb 28, 2020
CVE-2018-21035
In Qt through 5.14.1, the WebSocket implementation accepts up to 2GB for frames and 2GB for messages
7.5
CVSS
2.3%
EPSS
No
On KEV
Description
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
QT
QT · QT
through 5.14.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-21035
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-21035
Exploit
https://bugreports.qt.io/browse/QTBUG-70693
Patch
https://codereview.qt-project.org/c/qt/qtwebsockets/+/284735
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