VDB-231232 · CVE-2023-34494 · Issue 1180

emqx NanoMQ 0.16.5 nmq_mqtt.c nano_ctx_send use after free

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.
5.5	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in emqx NanoMQ 0.16.5. Affected by this issue is the function nano_ctx_send of the file nmq_mqtt.c. Executing a manipulation can lead to use after free. This vulnerability is tracked as CVE-2023-34494. No exploit exists.

Detailsinfo

A vulnerability has been found in emqx NanoMQ 0.16.5 and classified as critical. This vulnerability affects the function nano_ctx_send of the file nmq_mqtt.c. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

NanoMQ 0.16.5 is vulnerable to heap-use-after-free in the nano_ctx_send function of nmq_mqtt.c.

The weakness was disclosed 06/12/2023 as 1180. The advisory is shared for download at github.com. This vulnerability was named CVE-2023-34494 since 06/07/2023. There are known technical details, but no exploit is available.

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-38551). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

emqx

Name

NanoMQ

Version

0.16.5

Website

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

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/07/2023 🔍
06/12/2023 +5 days 🔍
06/12/2023 +0 days 🔍
01/07/2026 +940 days 🔍

Sourcesinfo

Product: github.com

Advisory: 1180
Status: Confirmed

CVE: CVE-2023-34494 (🔍)
GCVE (CVE): GCVE-0-2023-34494
GCVE (VulDB): GCVE-100-231232
EUVD: 🔍

Entryinfo

Created: 06/12/2023 16:43
Updated: 01/07/2026 11:45
Changes: 06/12/2023 16:43 (39), 01/07/2026 11:45 (16)
Complete: 🔍
Cache ID: 216::103

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