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CVE-2017-7650

23
FAUCET Score

CVE-2017-7650 describes a bypass vulnerability in Mosquitto versions prior to 1.4.12, affecting Mosquitto and Debian Linux distributions. This flaw allows authenticated clients to bypass pattern-based Access Control Lists (ACLs) by using '#' or '+' as their username or client ID, granting unauthorized access to MQTT topics. With a CVSS score of 6.5 (Medium), this vulnerability is easily exploitable over the network with low complexity, potentially leading to high confidentiality impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.4.12CPE matchmatch criteria
cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.47%
Probability of exploitation in next 30 days
EPSS Percentile
82.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0247 is in the 94th percentile among its peer group of 21,957 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

mosquitto.org / 2017/05/security-advisory-cve-2017-7650
PatchVendor Advisory
bugs.eclipse.org / bugs/show_bug.cgi
ExploitThird Party Advisory
debian.org / security/2017/dsa-3865
Third Party Advisory
securityfocus.com / bid/98741
Third Party AdvisoryVDB Entry