CVE-2023-33659

FAUCET Score

CVE-2023-33659 is a heap buffer overflow vulnerability in NanoMQ version 0.17.2, specifically within the nmq_subinfo_decode() function. This flaw allows an unauthenticated attacker to trigger a denial of service by sending specially crafted input. Rated 7.5 HIGH on CVSS, it requires no user interaction and has low attack complexity, posing a significant availability risk. Currently, there is no public exploit code, active exploitation, or significant community discussion surrounding this vulnerability.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		0.17.2CPE matchmatch criteria	cpe:2.3:a:emqx:nanomq:0.17.2:::::::*

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

1.07%

Probability of exploitation in next 30 days

EPSS Percentile

61.5%

Percentile rank of EPSS score among Peer Group

As of 2026-07-28

Model: v2026.06.15

This CVE's current EPSS score of 0.0107 is in the 39th 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

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference

View patch

References

github.com / emqx/nanomq

Product

github.com / emqx/nanomq/issues/1154

ExploitIssue TrackingThird Party Advisory

github.com / nanomq/NanoNNG/pull/509/commits/6815c4036a2344865da393803ecdb7af27d8bde1

Patch