A weakness has been identified in Cesanta Mongoose up to 7.21. Affected by this vulnerability is the function fn of the file tutorials/mqtt/mqtt-server/main.c of the component MQTT Broker. Executing a manipulation can lead to stack-based buffer overflow.
The attack can be launched remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.22 addresses this issue.
This patch is called a9df523f76f43a38bd53b4232b9cfd4c16869e71. Upgrading the affected component is advised.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 7
https://github.com/cesanta/mongoose/
cna@vuldb.com
https://github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c1686…
cna@vuldb.com
https://github.com/cesanta/mongoose/releases/tag/7.22
cna@vuldb.com
https://vuldb.com/cve/CVE-2026-101003
cna@vuldb.com
https://vuldb.com/submit/920005
cna@vuldb.com
https://vuldb.com/vuln/410873
cna@vuldb.com
https://vuldb.com/vuln/410873/cti
cna@vuldb.com