CVE catalog
CVE-2018-12551
mosquitto: CVE-2018-12551
- Severity
- High · CVSS 8.1
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 1.47% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | mosquitto | sid | 2.1.2-3 | fixed |
| Debian | mosquitto | forky | 2.1.2-3 | fixed |
| Debian | mosquitto | trixie | 2.0.21-1 | fixed |
| Debian | mosquitto | bookworm | 2.0.11-1.2+deb12u2 | fixed |
| Debian | mosquitto | bookworm-security | 2.0.11-1.2+deb12u1 | fixed |
| Alpine | mosquitto | 3.10 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.11 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.12 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.13 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.14 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.15 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.16 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.17 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.18 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.19 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.20 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.21 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.22 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.23 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.24 | 1.5.6-r0 | fixed |
| Alpine | mosquitto | 3.7 | 1.4.15-r1 | fixed |
| Alpine | mosquitto | 3.8 | 1.4.15-r4 | fixed |
| Alpine | mosquitto | 3.9 | 1.5.6-r0 | fixed |
| Ubuntu | mosquitto | 16.04 | 1.4.3-1 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.4-1 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.7-1 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.8-1 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.8-1build1 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.8-1ubuntu0.16.04.1 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.8-1ubuntu0.16.04.2 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.8-1ubuntu0.16.04.3 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.8-1ubuntu0.16.04.4 | vulnerable |
| Ubuntu | mosquitto | 16.04 | 1.4.8-1ubuntu0.16.04.5 | fixed |
| Ubuntu | mosquitto | 18.04 | 1.4.12-1 | vulnerable |
| Ubuntu | mosquitto | 18.04 | 1.4.14-1 | vulnerable |
| Ubuntu | mosquitto | 18.04 | 1.4.14-2 | vulnerable |
| Ubuntu | mosquitto | 18.04 | 1.4.14-2build1 | vulnerable |
| Ubuntu | mosquitto | 18.04 | 1.4.15-1 | vulnerable |
| Ubuntu | mosquitto | 18.04 | 1.4.15-2 | vulnerable |
| Ubuntu | mosquitto | 18.04 | 1.4.15-2ubuntu0.18.04.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | mosquitto | source | sid | 1.5.6-1 | not yet assigned | Not reported | [921976] |
| Debian | mosquitto | source | forky | 1.5.6-1 | not yet assigned | Not reported | [921976] |
| Debian | mosquitto | source | trixie | 1.5.6-1 | not yet assigned | Not reported | [921976] |
| Debian | mosquitto | source | bookworm | 1.5.6-1 | not yet assigned | Not reported | [921976] |
| Alpine | mosquitto | apk | 3.10 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.11 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.12 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.13 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.14 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.15 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.16 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.17 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.18 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.19 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.20 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.21 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.22 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.23 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.24 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.7 | 1.4.15-r1 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.8 | 1.4.15-r4 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Alpine | mosquitto | apk | 3.9 | 1.5.6-r0 | Not reported | ALPINE-CVE-2018-12551 | Not reported |
| Ubuntu | mosquitto | deb | 16.04 | 1.4.8-1ubuntu0.16.04.5 | Not reported | UBUNTU-CVE-2018-12551 | Not reported |
| Ubuntu | mosquitto | deb | 18.04 | 1.4.15-2ubuntu0.18.04.1 | Not reported | UBUNTU-CVE-2018-12551 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libmosquitto1]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [libmosquitto-dev]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [libmosquittopp1]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [libmosquittopp-dev]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [mosquitto]Fixed
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [mosquitto-clients]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· amd64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· arm64 · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· amd64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· arm64 · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
- [mosquitto-dev]Fixed
Source package: [mosquitto]
Details (6)
2.0.11-1.2+deb12u2· all · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u2· all · bookwormFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· all · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.21-1~bpo12+1· all · bookworm-backportsFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· all · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
2.0.11-1.2+deb12u1· all · bookworm-securityFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · bookworm; dsa · mosquitto · debian · 12
[Debian 13 (Trixie)]
- [libmosquitto1]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
- [libmosquitto-dev]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
- [libmosquittopp1]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
- [libmosquittopp-dev]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
- [mosquitto]Fixed
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
- [mosquitto-clients]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· amd64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
2.0.21-1· arm64 · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
- [mosquitto-dev]Fixed
Source package: [mosquitto]
Details (2)
2.0.21-1· all · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
2.0.21-1· all · trixieFixed · Fixed:
1.5.6-1dsa · mosquitto · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2019_0233-1.json]
- [https://osv.dev/vulnerability/ALPINE-CVE-2018-12551]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2018-12551]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2018-12551]
- [https://security-tracker.debian.org/tracker/CVE-2018-12551]
- [https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-12551.json]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]