CVE-2018-12551
HIGH8.1EPSS 0.60%Published: 3/27/2019Modified: 12/3/2025
Also known as:ALPINE-CVE-2018-12551DEBIAN-CVE-2018-12551
Description
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.
Affected packages (2)
- Alpine/mosquittofrom 0, < 1.5.6-r0
- Debian/mosquittofrom 0, < 1.5.6-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.1 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |