VDB-231088 · CVE-2023-33660 · Issue 1155

emqx NanoMQ 0.17.2 mqtt_parser.c copyn_str denial of service

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.1	$0-$5k	0.00

Summaryinfo

A vulnerability was found in emqx NanoMQ 0.17.2 and classified as problematic. Affected by this vulnerability is the function copyn_str of the file mqtt_parser.c. Executing a manipulation can lead to denial of service. This vulnerability appears as CVE-2023-33660. There is no available exploit. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability has been found in emqx NanoMQ 0.17.2 and classified as problematic. This vulnerability affects the function copyn_str of the file mqtt_parser.c. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

A heap buffer overflow vulnerability exists in NanoMQ 0.17.2. The vulnerability can be triggered by calling the function copyn_str() in the file mqtt_parser.c. An attacker could exploit this vulnerability to cause a denial of service attack.

The weakness was presented 06/08/2023 as 1155. The advisory is shared for download at github.com. This vulnerability was named CVE-2023-33660 since 05/22/2023. There are known technical details, but no exploit is available.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-37816). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

emqx

Name

NanoMQ

Version

0.17.2

Website

Product: https://github.com/emqx/nanomq/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 7.5
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

05/22/2023 🔍
06/08/2023 +17 days 🔍
06/08/2023 +0 days 🔍
01/05/2026 +942 days 🔍

Sourcesinfo

Product: github.com

Advisory: 1155
Status: Confirmed

CVE: CVE-2023-33660 (🔍)
GCVE (CVE): GCVE-0-2023-33660
GCVE (VulDB): GCVE-100-231088
EUVD: 🔍

Entryinfo

Created: 06/08/2023 14:39
Updated: 01/05/2026 18:55
Changes: 06/08/2023 14:39 (42), 07/07/2023 09:54 (11), 01/06/2025 23:24 (26), 01/05/2026 18:55 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.