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CVE-2018-12550

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and...

8.1 HighFix available

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.35%Up 0.7 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 8.1

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Record
CVE-2018-12550
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-440
Updated
2026-11-02
CVE List No score

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Record
CVE-2018-12550
Weakness
CWE-440
Updated
2026-11-02
EUVDEUVD-2018-4510 No score

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Record
EUVD-2018-4510
Updated
2026-11-03
GitHub AdvisoriesGHSA-5cgw-j2m3-gxhw 8.1

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and...

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Record
GHSA-5cgw-j2m3-gxhw
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVALPINE-CVE-2018-12550 8.1

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Record
ALPINE-CVE-2018-12550
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVBELL-CVE-2018-12550 8.1

CVE-2018-12550 does not affect BellSoft software

Record
BELL-CVE-2018-12550
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 6 moreShow less
OSV 8.1

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Record
CVE-2018-12550
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2018-12550 8.1

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Record
DEBIAN-CVE-2018-12550
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2018-12550 8.1

When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use an ACL file, and that ACL file is empty, or contains only comments or blank lines, then Mosquitto will treat this as though no ACL file has been defined and use a default allow policy. The new behaviour is to have an empty ACL file mean that all access is denied, which is not a useful configuration but is not unexpected.

Record
UBUNTU-CVE-2018-12550
CVSS 3.0
8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2019:0233-1 No score

Security update for mosquitto

This update for mosquitto fixes the following issues:

Security issues fixed:

  • CVE-2018-12546: Fixed an issue with revoked access to topics (bsc#1125019).
  • CVE-2018-12551: Fixed an issue which allowed malformed data in the password file to be treated as valid (bsc#1125020).
  • CVE-2018-12550: Fixed an an issue which treats an empty ACL file wrongly (bsc#1125021).
Record
openSUSE-SU-2019:0233-1
Updated
2026-11-02
OSVopenSUSE-SU-2019:0237-1 No score

Security update for mosquitto

This update for mosquitto fixes the following issues:

Security issues fixed:

  • CVE-2018-12546: Fixed an issue with revoked access to topics (bsc#1125019).
  • CVE-2018-12551: Fixed an issue which allowed malformed data in the password file to be treated as valid (bsc#1125020).
  • CVE-2018-12550: Fixed an an issue which treats an empty ACL file wrongly (bsc#1125021).

This update was imported from the openSUSE:Leap:15.0:Update update project.

Record
openSUSE-SU-2019:0237-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11057-1 No score

libmosquitto1-2.0.11-1.2 on GA media

These are all security issues fixed in the libmosquitto1-2.0.11-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11057-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mosquitto
Alpine:v3.10
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.11
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.12
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.13
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.14
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.15
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.16
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.17
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.18
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.19
 1.0 up to 1.5.6-r0
1.5.6-r0
Show 17 moreShow less
Affected packages
PackageAffectedFixed
mosquitto
Alpine:v3.20
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.21
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.22
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.23
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.24
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Alpine:v3.7
 1.0 up to 1.4.15-r1
1.4.15-r1
mosquitto
Alpine:v3.8
 1.0 up to 1.4.15-r4
1.4.15-r4
mosquitto
Alpine:v3.9
 1.0 up to 1.5.6-r0
1.5.6-r0
mosquitto
Debian:12
 before 1.5.6-1
1.5.6-1
mosquitto
Debian:13
 before 1.5.6-1
1.5.6-1
mosquitto
Debian:14
 before 1.5.6-1
1.5.6-1
mosquitto
Debian:8
From an advisory covering 4 CVEs
 before 1.3.4-2+deb8u4, plus listed versions
1.3.4-21.3.4-2+deb8u11.3.4-2+deb8u21.3.4-2+deb8u3
1.3.4-2+deb8u4
mosquitto
Debian:9
From an advisory covering 3 CVEs
 before 1.4.10-3+deb9u3, plus listed versions
1.4.10-31.4.10-3+deb9u11.4.10-3+deb9u2
1.4.10-3+deb9u3
mosquitto
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
0.15-2ubuntu10.15-2ubuntu1.10.15-2ubuntu1.20.15-2+deb7u3ubuntu0.10.15-2+deb7u3ubuntu0.1+esm1
 None known
mosquitto
Ubuntu:16.04:LTS
 before 1.4.8-1ubuntu0.16.04.5, plus listed versions
1.4.3-11.4.4-11.4.7-11.4.8-11.4.8-1build1
Show 4 moreShow less
1.4.8-1ubuntu0.16.04.11.4.8-1ubuntu0.16.04.21.4.8-1ubuntu0.16.04.31.4.8-1ubuntu0.16.04.4
1.4.8-1ubuntu0.16.04.5
mosquitto
Ubuntu:18.04:LTS
 before 1.4.15-2ubuntu0.18.04.1, plus listed versions
1.4.12-11.4.14-11.4.14-21.4.14-2build11.4.15-11.4.15-2
1.4.15-2ubuntu0.18.04.1
mosquitto
SUSE:Package Hub 15
From an advisory covering 3 CVEs
 before 1.4.15-bp150.3.3.1
1.4.15-bp150.3.3.1

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-12550 is a high vulnerability (CVSS 8.1) in Eclipse Mosquitto, published February 10, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.35%, the 71st percentile. Fixed in mosquitto 1.5.6-r0.

References

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