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CVE-2021-33176

24
FAUCET Score

CVE-2021-33176 describes a denial-of-service vulnerability affecting VerneMQ MQTT Broker versions prior to 1.12.0, caused by excessive memory consumption when processing untrusted inputs. This unauthenticated network-based attack has low complexity and can lead to the application being terminated by the operating system, resulting in a high availability impact. While no public exploit code is currently available and it is not listed in CISA's KEV catalog, the vulnerability has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.12.0CPE matchmatch criteria
cpe:2.3:a:octavolabs:vernemq:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.10%
Probability of exploitation in next 30 days
EPSS Percentile
62.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0110 is in the 40th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

synopsys.com / blogs/software-security/cyrc-advisory-rabbitmq-emqx-vernemq
Third Party Advisory