CVE-2026-82782Network attack vector

Authenticated web settings interruption via out-of-bounds write

Published Sep 14, 2026 · Updated Sep 14, 2026

Out-of-bounds write in CONTEC CONPROSYS nano firmware allows remote authenticated users to stop the web settings function via a crafted URL. The vendor states only that specifying an unauthorized URL causes the write and has not disclosed the affected file, function, or buffer operation. A valid low-privilege session and network reachability are required, and the documented consequence is interruption of the web settings function.

CVSS severity4.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in CONTEC CONPROSYS nano firmware allows remote authenticated users to stop the web settings function via a crafted URL. The vendor states only that specifying an unauthorized URL causes the write and has not disclosed the affected file, function, or buffer operation. A valid low-privilege session and network reachability are required, and the documented consequence is interruption of the web settings function.

The record

CVE
CVE-2026-82782
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
CONTEC Co., Ltd.
Product
CONPROSYS nano CPSN-PCB271-S1-041 Programmable Remote I/O Communication Coupler
Classifications
CWE-787, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.61

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CONTEC Co., Ltd. · CONPROSYS nano CPSN-PCB271-S1-041 Programmable Remote I/O Communication Couplerversion=0 <1.61
CONTEC Co., Ltd. · CONPROSYS nano CPSN-MCB271 Remote I/O CPU Unitversion=0 <1.82
CONTEC Co., Ltd. · CONPROSYS nano CPSN-EOB471EI EtherNet/IP Coupler Unitversion=0 <1.02

Published CVSS scores

4.3CONTEC Co., Ltd.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
5.3JPCERT/CC and IPACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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