What’s Vulnerable › Vulnerabilities

CVE-2021-34434

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-30 · updated 2026-06-17
• Weakness: CWE-285

Description

In Eclipse Mosquitto versions 2.0 to 2.0.11, when using the dynamic security plugin, if the ability for a client to make subscriptions on a topic is revoked when a durable client is offline, then existing subscriptions for that client are not revoked.

Affected products

• The Eclipse Foundation Eclipse Mosquitto: from 2.0.0 through 2.0.11
• Fedoraproject Fedora: 34, 35

References

• https://bugs.eclipse.org/bugs/show_bug.cgi?id=575324
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K4WWGVF5BUFPYPCFUPPP4KRIYI5OTJN2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RLUUM52Y6AEICPXPSRRXC6OBY4H5XKW7/
• https://www.debian.org/security/2023/dsa-5511
• https://bugs.eclipse.org/bugs/show_bug.cgi?id=575324
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K4WWGVF5BUFPYPCFUPPP4KRIYI5OTJN2/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RLUUM52Y6AEICPXPSRRXC6OBY4H5XKW7/
• https://www.debian.org/security/2023/dsa-5511

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