CVE-2018-21035

qt5-qtwebsockets: websocket implementation allows only limited size for frames and messages therefore attacker can cause DOS

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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).

En Qt versiones hasta 5.14.1, la implementación de WebSocket acepta hasta 2GB para tramas y 2GB para mensajes. Los límites más pequeños no pueden ser configurados. Esto hace más fácil para los atacantes causar una denegación de servicio (consumo de memoria)

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-02-28 CVE Reserved
2020-02-28 CVE Published
2023-03-07 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-770: Allocation of Resources Without Limits or Throttling

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC
https://bugreports.qt.io/browse/QTBUG-70693	2024-08-05

URL	Date	SRC
https://codereview.qt-project.org/c/qt/qtwebsockets/+/284735	2020-08-24

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2018-21035	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1810964	2020-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Qt Search vendor "Qt"		Qt Search vendor "Qt" for product "Qt"				<= 5.14.1 Search vendor "Qt" for product "Qt" and version " <= 5.14.1"		-		Affected