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MosquittoApplication · Eclipse

CVE-2023-5632

HIGH · 7.5 CVSS v3.1 Published 2023-10-18
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In Eclipse Mosquito before and including 2.0.5, establishing a connection to the mosquitto server without sending data causes the EPOLLOUT event to be added, which results excessive CPU consumption. This could be used by a malicious actor to perform denial of service type attack. This issue is fixed in 2.0.6

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
MosquittoApplication
Affected:= 2.0.5

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch github.com →
Recommended fix High confidence

2.0.6

  1. 1. Backup your current Mosquitto configuration and any persistent data.
  2. 2. Stop the Mosquitto service to prevent active connections during upgrade.
  3. 3. Upgrade Mosquitto to version 2.0.6 using your system's package manager or by compiling from source.
  4. 4. For package manager: Run 'apt-get update && apt-get install mosquitto' (Debian/Ubuntu) or 'yum update mosquitto' (RHEL/CentOS) to obtain version 2.0.6.
  5. 5. Alternatively, download Mosquitto 2.0.6 source from https://mosquitto.org/download/ and compile with standard build tools.
  6. 6. Restore your configuration file (mosquitto.conf) if needed.
  7. 7. Start the Mosquitto service and verify it is running correctly.
  8. 8. Monitor for any anomalies in CPU usage to confirm the vulnerability is remediated.

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-5632 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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