Cesanta Mongoose MQTT Broker main.c fn stack-based overflow
Summary
| CVE | CVE-2026-101003 |
|---|---|
| State | PUBLISHED |
| Assigner | VulDB |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-28 06:16:31 UTC |
| Updated | 2026-09-28 15:16:04 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 5.5 MEDIUM from [email protected]
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.004620000 probability, percentile 0.376020000 (date 2026-09-29)
Problem Types: CWE-119 | CWE-121 | CWE-121 Stack-based Buffer Overflow | CWE-119 Memory Corruption
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 5.5 | MEDIUM | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/C... |
| 4.0 | CNA | DECLARED | 6.9 | MEDIUM | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P |
| 3.1 | [email protected] | Primary | 5.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| 3.1 | CNA | DECLARED | 5.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C |
| 3.0 | CNA | DECLARED | 5.3 | MEDIUM | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C |
| 2.0 | [email protected] | Secondary | 5 | AV:N/AC:L/Au:N/C:N/I:N/A:P | |
| 2.0 | CNA | DECLARED | 5 | AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
NoneUser Interaction
NoneConfidentiality
NoneIntegrity
NoneAvailability
LowSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
LowCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v3.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
LowCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Cesanta | Mongoose | affected 7.0 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.1 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.2 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.3 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.4 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.5 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.6 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.7 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.8 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.9 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.10 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.11 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.12 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.13 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.14 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.15 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.16 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.17 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.18 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.19 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.20 | Not specified |
| CNA | Cesanta | Mongoose | affected 7.21 | Not specified |
| CNA | Cesanta | Mongoose | unaffected 7.22 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| vuldb.com/vuln/410873/cti | [email protected] | vuldb.com | |
| vuldb.com/cve/CVE-2026-101003 | [email protected] | vuldb.com | |
| vuldb.com/vuln/410873 | [email protected] | vuldb.com | |
| vuldb.com/submit/920005 | [email protected] | vuldb.com | |
| github.com/cesanta/mongoose/releases/tag/7.22 | [email protected] | github.com | |
| github.com/cesanta/mongoose/commit/a9df523f76f43a38bd53b4232b9cfd4c16869e71 | [email protected] | github.com | |
| github.com/cesanta/mongoose | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: nemo2533 (VulDB User) (en)
CNA: VulDB Vulnerability Moderation Team (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-09-27T00:00:00.000Z | Advisory disclosed |
| CNA | 2026-09-27T02:00:00.000Z | VulDB entry created |
| CNA | 2026-09-27T12:34:42.000Z | VulDB entry last update |
There are currently no legacy QID mappings associated with this CVE.