TI-2018-09010 Aliases CVE-2018-12551 GHSA-5hh6-jrm5-mqxq

Improper authentication in Eclipse Mosquitto

LOW 38CWE-703Published 2019-03-27 · Updated 2024-08-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use a password file for authentication, any malformed data in the password file will be treated as valid. This typically means that the malformed data becomes a username and no password. If this occurs, clients can circumvent authentication and get access to the broker by using the malformed username. In particular, a blank line will be treated as a valid empty username. Other security measures are unaffected. Users who have only used the mosquitto_passwd utility to create and modify their password files are unaffected by this vulnerability.

Why it matters now

EPSS 0.01475 73rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

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
Eclipse Foundation	Eclipse Mosquitto	1.0 and later; up to 1.5.5	—	No fix listed	CNA

Eclipse Mosquitto VendorEclipse Foundation Affected 1.0 and later; up to 1.5.5 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:eclipse:mosquitto::::::::	1.0 – 1.5.5	Vulnerable	Eclipse Foundation

cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:* Versions 1.0 – 1.5.5 Vulnerable ·Eclipse Foundation

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2019-03-27
The Eclipse Foundation Eclipse Mosquitto unspecified
4 records Highest priority Priority LOW 4 LOW
Other records, highest priority first
- TI-2018-09009 When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file…Priority LOW 38
- TI-2017-05291 NULL pointer dereference in Eclipse MosquittoPriority LOW 36
- TI-2018-09005 Improper access control in Eclipse MosquittoPriority LOW 30
Show all 4 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2018-12551
2026-10-03 Alias added: GHSA-5hh6-jrm5-mqxq

References

Exploit 1

https://bugs.eclipse.org/bugs/show_bug.cgi?id=543401

Other 1

[debian-lts-announce] 20191026 [SECURITY] [DLA 1972-1] mosquitto security update

TI-2024-09749 Eclipse Mosquito: Heap Buffer Overflow in my_subscribe_callback CVSS 4.0HIGH 7.2
TI-2018-09002 Reachable assertion in Eclipse Mosquitto CVSS 3.0HIGH 7.5
TI-2023-12912 The broker in Eclipse Mosquitto 1.3.2 through 2.x before 2.0.16 has a memory leak that… CVSS 3.1HIGH 7.5
TI-2017-05287 Uncontrolled resource consumption in Eclipse Mosquitto CVSS 3.0HIGH 7.5
TI-2023-05183 Unconditionally adding an event to the epoll causes excessive CPU consumption CVSS 3.1HIGH 7.5
TI-2018-09009 When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file… CVSS 3.0HIGH 8.1

See all 25 →

Sources

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