CVE-2026-0647
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn improper authentication security issue exists within the 1794-AENTR adapter's embedded web server. The vulnerability allows an unauthenticated attacker to change the device's web interface password by sending a crafted HTTP GET request to a specific endpoint, without any prior authentication being required. If exploited, this could lead to unauthorized access, account takeover, and loss of the device’s embedded web server’s availability.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThis is an improper authentication vulnerability in the 1794-AENTR adapter's embedded web server. An unauthenticated attacker can change the device's web interface password by sending a crafted HTTP GET request to a specific endpoint, leading to account takeover and denial of service.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify 1794-AENTR adapter on the networkScan the network for devices with the 1794-AENTR model identifier, or check network documentation for Flex I/O Ethernet adapters. Use Nmap or network scanning tools to detect devices responding to Ethernet/IP queries.Affected if The 1794-AENTR adapter is present in the environment.
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Verify embedded web server is enabledAccess the device's web interface via its IP address using a browser, or query the device configuration via EtherNet/IP to check if the embedded web server feature is active. Look for HTTP/HTTPS ports (typically 80/443) responding on the device's IP.Affected if The embedded web server is enabled and responding to HTTP/HTTPS requests.
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Check network exposure of the web interfaceDetermine if the device's web server IP port is accessible from untrusted networks. Review firewall rules, VLAN assignments, and network segmentation to verify whether the web interface is reachable from outside the control network.Affected if The web interface is accessible from networks outside the trusted control system zone.
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Confirm web interface accepts unauthenticated requestsSend a crafted HTTP GET request to the device and observe if the response indicates authentication is bypassed or if password change parameters are accepted without prior authentication. Compare behavior against expected authentication challenges.Affected if The web interface accepts requests and responds without requiring valid authentication credentials.
A user is affected if a 1794-AENTR adapter with its embedded web server enabled is present and the web interface is accessible from the network without authentication barriers.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataRestrict network access to the device's web interface via firewall rules or VLAN segmentation. If available, apply vendor firmware updates to remediate the authentication bypass.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-0647 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-0647 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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