Qt up to 5.14.1 WebSocket Messages memory allocation

CVSS Meta Temp Score
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CTI Interest Score
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7.7$0-$5k0.04

A vulnerability, which was classified as problematic, has been found in Qt up to 5.14.1. This issue affects an unknown functionality of the component WebSocket. The manipulation as part of a Messages leads to a memory allocation vulnerability. Using CWE to declare the problem leads to CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. Impacted is availability. The summary by CVE is:

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).

The weakness was published 02/28/2020. The identification of this vulnerability is CVE-2018-21035 since 02/28/2020. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
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VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.7

VulDB Base Score: 5.8
VulDB Temp Score: 5.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.6
NVD Vector: 🔍

CNA Base Score: 8.6
CNA Vector (MITRE): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory allocation
CWE: CWE-789 / CWE-400 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

02/28/2020 🔍
02/28/2020 +0 days 🔍
02/29/2020 +1 days 🔍
04/07/2024 +1499 days 🔍

Sourcesinfo

Advisory: bugreports.qt.io
Status: Not defined

CVE: CVE-2018-21035 (🔍)

Entryinfo

Created: 02/29/2020 19:36
Updated: 04/07/2024 14:04
Changes: 02/29/2020 19:36 (35), 02/29/2020 19:41 (11), 04/07/2024 13:58 (16), 04/07/2024 14:04 (19)
Complete: 🔍

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