TI-2021-12726 Aliases CVE-2021-33175 GHSA-7vcw-x89j-vrrc

Deserialization of untrusted data in EMQ X Broker

LOW 35CWE-502Published 2021-06-08 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution, Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-502 and CWE-770.

Summary

EMQ X Broker versions prior to 4.2.8 are vulnerable to a denial of service attack as a result of excessive memory consumption due to the handling of untrusted inputs. These inputs cause the message broker to consume large amounts of memory, resulting in the application being terminated by the operating system.

Why it matters now

EPSS 0.011 65th percentileScored 2026-11-07

Fix Fixed EMQ X Broker (EMQ Technologies): 4.2.8

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
EMQ Technologies	EMQ X Broker	before 4.2.8	4.2.8	Patch available	CNA

EMQ X Broker VendorEMQ Technologies Affected before 4.2.8 Fixed in 4.2.8 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:emqx:emq_x_broker::::::::	before 4.2.8	Vulnerable	nanomq

cpe:2.3:a:emqx:emq_x_broker:*:*:*:*:*:*:*:* Versions before 4.2.8 Vulnerable ·nanomq

Remediation

Fix · CNA EMQ X Broker (EMQ Technologies) Fixed in 4.2.8

Timeline

2026-10-02 Threatist record created from CVE-2021-33175
2026-10-03 Alias added: GHSA-7vcw-x89j-vrrc

References

Patch 1

https://www.synopsys.com/blogs/software-security/cyrc-advisory-rabbitmq-emqx-vernemq

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences