The broker in Eclipse Mosquitto 1.3.2 through 2.x before 2.0.16 has a memory leak that can be abused remotely when a client sends many QoS 2
The broker in Eclipse Mosquitto 1.3.2 through 2.x before 2.0.16 has a memory leak that can be abused remotely when a client sends many QoS 2 messages with duplicate message IDs, and fails to respond to PUBREC commands. This occurs because of mishandling of EAGAIN from the libc send function.
- Published
- Sep 1, 2023
- Updated
- Jun 17, 2026
- EPSS
- 1.3% · 70th percentile
- CWE
- CWE-401
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Report tools
Action score
30
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| eclipse | mosquitto | cpe:2.3:a:eclipse:mosquitto |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- eclipse mosquitto1.3.2 and later · before 2.0.16
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.18 | mosquitto | from 1.3.2 · before 2.0.16-r0 | 2.0.16-r0 |
| Debian:11 | mosquitto | before 2.0.11-1+deb11u1 | 2.0.11-1+deb11u1 |
| Debian:12 | mosquitto | before 2.0.11-1.2+deb12u1 | 2.0.11-1.2+deb12u1 |
| Debian:13 | mosquitto | before 2.0.17-1 | 2.0.17-1 |
| Red Hat:satellite_capsule:6.13::el8 | foreman | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite_capsule:6.13::el8 | foreman-debug | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite_capsule:6.14::el8 | mosquitto | before 0:2.0.17-1.el8sat | 0:2.0.17-1.el8sat |
| Red Hat:satellite_capsule:6.14::el8 | mosquitto-debuginfo | before 0:2.0.17-1.el8sat | 0:2.0.17-1.el8sat |
| Red Hat:satellite_capsule:6.14::el8 | mosquitto-debugsource | before 0:2.0.17-1.el8sat | 0:2.0.17-1.el8sat |
| Red Hat:satellite_capsule:6.14::el8 | puppet-agent | before 0:7.27.0-1.el8sat | 0:7.27.0-1.el8sat |
| Red Hat:satellite_capsule:6.14::el8 | puppetserver | before 0:7.14.0-1.el8sat | 0:7.14.0-1.el8sat |
| Red Hat:satellite_utils:6.13::el8 | foreman-cli | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-dynflow-sidekiq | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-ec2 | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-journald | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-libvirt | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-openstack | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-ovirt | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-postgresql | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-service | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-telemetry | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.13::el8 | foreman-vmware | before 0:3.5.1.24-1.el8sat | 0:3.5.1.24-1.el8sat |
| Red Hat:satellite:6.14::el8 | candlepin | before 0:4.3.11-1.el8sat | 0:4.3.11-1.el8sat |
| Red Hat:satellite:6.14::el8 | candlepin-selinux | before 0:4.3.11-1.el8sat | 0:4.3.11-1.el8sat |
+5
Same product
eclipse: all recordsOther highest-scoring records for the same primary product.
- CVE-2024-10525Eclipse Mosquito: Heap Buffer Overflow in my_subscribe_callback46Plan
- CVE-2018-12543In Eclipse Mosquitto versions 1.5 to 1.5.2 inclusive, if a message is published to Mosquitto that has a topic starting with $, but that is n41Plan
- CVE-2018-12551When Eclipse Mosquitto version 1.0 to 1.5.5 (inclusive) is configured to use a password file for authentication, any malformed data in the p32Monitor
- CVE-2018-12550When 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 comme32Monitor
- CVE-2017-7651In Eclipse Mosquitto 1.4.14, a user can shutdown the Mosquitto server simply by filling the RAM memory with a lot of connections with large 32Monitor
- CVE-2017-7655In Eclipse Mosquitto version from 1.0 to 1.4.15, a Null Dereference vulnerability was found in the Mosquitto library which could lead to cra31Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:mosquitto | 2.0.16-r0 · Alpine:v3.18 | Package registry (OSV) |
| debian:mosquitto | 2.0.11-1.2+deb12u1 · Debian:12 | Package registry (OSV) |
| red hat:candlepin | 0:4.3.11-1.el8sat · Red Hat:satellite:6.14::el8 | Package registry (OSV) |
| red hat:candlepin-selinux | 0:4.3.11-1.el8sat · Red Hat:satellite:6.14::el8 | Package registry (OSV) |
| red hat:mosquitto | 0:2.0.17-1.el8sat · Red Hat:satellite_capsule:6.14::el8 | Package registry (OSV) |
| red hat:mosquitto-debuginfo | 0:2.0.17-1.el8sat · Red Hat:satellite_capsule:6.14::el8 | Package registry (OSV) |
| red hat:mosquitto-debugsource | 0:2.0.17-1.el8sat · Red Hat:satellite_capsule:6.14::el8 | Package registry (OSV) |
| red hat:puppet-agent | 0:7.27.0-1.el8sat · Red Hat:satellite_capsule:6.14::el8 | Package registry (OSV) |
| red hat:puppetserver | 0:7.14.0-1.el8sat · Red Hat:satellite_capsule:6.14::el8 | Package registry (OSV) |
| red hat:rubygem-grpc | 0:1.58.0-1.el8sat · Red Hat:satellite:6.14::el8 | Package registry (OSV) |
| red hat:rubygem-puma | 0:6.3.1-1.el8sat · Red Hat:satellite:6.14::el8 | Package registry (OSV) |
| red hat:rubygem-puma-debuginfo | 0:6.3.1-1.el8sat · Red Hat:satellite:6.14::el8 | Package registry (OSV) |
| red hat:rubygem-puma-debugsource | 0:6.3.1-1.el8sat · Red Hat:satellite:6.14::el8 | Package registry (OSV) |
| red hat:rubygem-sidekiq | 0:6.5.12-1.el8sat · Red Hat:satellite:6.14::el8 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-401 · Missing Release of Memory after Effective LifetimeCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- github.com/eclipse/mosquitto/commit/6113eac95a9df634fbc858be542c4a0456bfe7b9
- github.com/eclipse/mosquitto/compare/v2.0.15...v2.0.16
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJ2FMBGVVQEQWTTQB7YLKTAHMX2UM66X/
- mosquitto.org/blog/2023/08/version-2-0-16-released/
- security.gentoo.org/glsa/202401-09
- www.compass-security.com/fileadmin/Research/Advisories/2023_02_CSNC-2023-001_Eclipse_Mosquitto_Memory_Leak.txt
- www.debian.org/security/2023/dsa-5511
Vendor advisories and official records. Exploit/PoC links are deliberately left out.