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CVE-2021-33175

HIGH
7.5
CVSS Score
Published: June 8, 2021 at 02:31 PM UTC
Updated: June 17, 2026 at 03:54 AM UTC
2 products affected across 2 vendorsEmq X BrokerEMQ X Broker

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Severity
HIGH7.5
Exploit prediction
EPSS 1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Emq X Broker· Emqx
95%
v < 4.2.8
Affected range stops below 4.2.8, so it looks safe — our inference, not a vendor statement
EMQ X Broker· Emq
60%
v < 4.2.8
Affected range stops below 4.2.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://www.synopsys.com/blogs/software-security/cyrc-advisory-rabbitmq-emqx-vernemq

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-502CWE-770

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