CVE-2023-28366: eclipse mosquitto
Vulnerability summary
CVE-2023-28366 is a high (CVSS 7.5) vulnerability in eclipse mosquitto. EPSS estimates a 1.31% chance of exploitation in the next 30 days, higher than 70.7% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 04-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 4 · Related 1Timeline
- 01-09-2023PublishedVulnerability first disclosed.
- 26-06-2025Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
5 scores · 5 sources · 1 version- OSV · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
1.31%
Chance of exploitation in the next 30 days
Percentile
71%
Versus all other CVEs
30-day change
Decrease -0.01 pp
From 1.32% on 05-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Alpine1 product
- mosquitto≥ 1.3.2, < 2.0.16-r0
Debian1 product
- mosquitto< 2.0.11-1.2+deb12u1 | < 2.0.17-1
Eclipse1 product
- mosquitto≥ 1.3.2, < 2.0.16
Mageia1 product
- mosquitto< 2.0.21-1.mga9
Ubuntu1 product
- mosquittoAll versions (No fix recorded) | < 2.0.11-1ubuntu1.1
5 vendors · 5 products
References
14 links- lists.fedoraproject.org/archives/…Vendor Advisory
www.debian.org/security/2023/dsa-5511Vendor Advisory- security.gentoo.org/glsa/202401-09Vendor Advisory