CVE-2021-20650
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 · uneditedCross-site request forgery (CSRF) vulnerability in ELECOM NCC-EWF100RMWH2 allows remote attackers to hijack the authentication of administrators and execute an arbitrary request via unspecified vector. As a result, the device settings may be altered and/or telnet daemon may be started.
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 · moderate confidenceCSRF vulnerability in ELECOM NCC-EWF100RMWH2 wireless bridge device allows remote attackers to hijack authenticated administrator sessions and execute arbitrary requests by tricking logged-in admins into visiting malicious pages. This can lead to unauthorized changes to device configuration and activation of the telnet daemon.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsCVSS 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
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
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.
-
Identify the device modelLocate the device physically or access the admin interface and check the model number displayed in the firmware settings or on the device label. Look for 'Ncc Ewf100rmwh2' or 'ELECOM' branding.Affected if The device model is ELECOM Ncc Ewf100rmwh2 or related ELECOM wireless bridge products
-
Verify firmware versionAccess the device admin web interface (typically via browser at the device IP address) and navigate to the firmware or status page to view the installed firmware version.Affected if Any firmware version is installed on the ELECOM NCC-EWF100RMWH2 device (all versions are affected)
-
Check admin interface network exposureDetermine if the device administrative interface is accessible from untrusted networks. Use network scanning tools or check router/firewall rules to see if ports used for admin access (typically HTTP/HTTPS on the device LAN IP) are exposed to the internet or untrusted VLANs.Affected if The admin web interface is reachable from networks outside the trusted local network
-
Assess telnet service statusAttempt to connect to the device via telnet port 23 (or check device configuration pages) to see if the telnet daemon is currently active or can be activated.Affected if Telnet service is enabled or accessible on the device, as the CVEs impact includes unauthorized telnet activation
Users are affected if they own an ELECOM NCC-EWF100RMWH2 device with the admin interface accessible from untrusted networks, regardless of firmware version since all versions are vulnerable to CSRF attacks.
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 dataApply vendor firmware update containing CSRF protection (anti-CSRF tokens). Until patch available, restrict administrative access to trusted networks only and avoid browsing untrusted sites while logged into device admin interface.
- Consultation2.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20650 — 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-2021-20650 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data