CVE-2021-41039: eclipse mosquitto
Vulnerability summary
CVE-2021-41039 is a high (CVSS 7.5) vulnerability in eclipse mosquitto. EPSS estimates a 1.35% chance of exploitation in the next 30 days, higher than 71.6% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 01-12-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
In versions 1.6 to 2.0.11 of Eclipse Mosquitto, an MQTT v5 client connecting with a large number of user-property properties could cause excessive CPU usage, leading to a loss of performance and possible denial of service.
CVSS metrics
4 scores · 3 sources · 2 versions- 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
EPSS trend
Probability
1.35%
Chance of exploitation in the next 30 days
Percentile
72%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.35% on 04-10-2026
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
1 foundExploit Reference (bugs.eclipse.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Debian1 product
- mosquitto< 2.0.11-1.2
Eclipse1 product
- mosquitto≥ 1.6, ≤ 2.0.11
The eclipse foundation1 product
- eclipse mosquitto≥ 1.6, < unspecified | ≥ unspecified, ≤ 2.0.11
Ubuntu1 product
- mosquitto< 1.6.9-1ubuntu0.1~esm1 | < 2.0.11-1ubuntu1.1
4 vendors · 4 products
References
6 links
www.debian.org/security/2023/dsa-5511Vendor Advisory