CVE-2021-28166
MEDIUMCVSS 6.5/10EPSS 0.97%
Last modified
CVE-2021-28166 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.. EPSS estimates a 0.97% chance of exploitation in the next 30 days.
Description
In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Eclipse | Mosquitto | >= 2.0.0, <= 2.0.9 |
References
- https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608Issue Tracking, Patch, Vendor Advisory
- https://bugs.eclipse.org/bugs/show_bug.cgi?id=572608Issue Tracking, Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-28166?
In Eclipse Mosquitto version 2.0.0 to 2.0.9, if an authenticated client that had connected with MQTT v5 sent a crafted CONNACK message to the broker, a NULL pointer dereference would occur.
How severe is CVE-2021-28166?
CVE-2021-28166 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28166?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-28160Wireless-N WiFi Repeater REV 1.0 (28.08.06.1) suffers from a…6.1
- CVE-2021-28161In Eclipse Theia versions up to and including 1.8.0, in the …6.1
- CVE-2021-28162In Eclipse Theia versions up to and including 0.16.0, in the…6.1
- CVE-2021-28163In Eclipse Jetty 9.4.32 to 9.4.38, 10.0.0.beta2 to 10.0.1, a…2.7
- CVE-2021-28164In Eclipse Jetty 9.4.37.v20210219 to 9.4.38.v20210224, the d…5.3
- CVE-2021-28165In Eclipse Jetty 7.2.2 to 9.4.38, 10.0.0.alpha0 to 10.0.1, a…7.5
- CVE-2021-28167In Eclipse Openj9 to version 0.25.0, usage of the jdk.intern…6.5
- CVE-2021-28168Eclipse Jersey 2.28 to 2.33 and Eclipse Jersey 3.0.0 to 3.0.…5.5
- CVE-2021-28169For Eclipse Jetty versions <= 9.4.40, <= 10.0.2, <= 11.0.2, …5.3
- CVE-2021-28170In the Jakarta Expression Language implementation 3.0.3 and …5.3
- CVE-2021-28171The Vangene deltaFlow E-platform does not take properly prot…9.8
- CVE-2021-28172There is a Path Traversal vulnerability in the file download…7.5
Are you affected by CVE-2021-28166?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST