Authenticated service interruption via invalid settings parameters
Published Sep 14, 2026 · Updated Sep 14, 2026
Stack-based buffer overflow in CONTEC CPSN-MCB271 firmware before 1.82 allows remote authenticated users to interrupt service. Insufficient MQTT and SNMP settings validation permits invalid parameters to overrun a stack buffer; the vendor does not identify the exact routine. Low-privileged network access is required, and successful exploitation stops the embedded system without reported data disclosure or modification.
Summary
What happened
Stack-based buffer overflow in CONTEC CPSN-MCB271 firmware before 1.82 allows remote authenticated users to interrupt service. Insufficient MQTT and SNMP settings validation permits invalid parameters to overrun a stack buffer; the vendor does not identify the exact routine. Low-privileged network access is required, and successful exploitation stops the embedded system without reported data disclosure or modification.
The record
- CVE
- CVE-2026-82785
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Vendor
- CONTEC Co., Ltd.
- Product
- CONPROSYS nano CPSN-MCB271 Remote I/O Coupler Unit (Server Type)
- Classifications
- CWE-121, T1499
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 14, 2026CVE publishedPublication date reported by the CVE source.
- Sep 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <1.82
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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