CVE-2020-35233
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 · uneditedThe TFTP server fails to handle multiple connections on NETGEAR JGS516PE/GS116Ev2 v2.6.0.43 devices, and allows external attackers to force device reboots by sending concurrent connections, aka a denial of service attack.
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 confidenceThe TFTP server on NETGEAR JGS516PE and GS116Ev2 switches (firmware v2.6.0.43) contains a race condition or resource exhaustion flaw when handling concurrent connections. An unauthenticated remote attacker can send multiple simultaneous TFTP requests to trigger device reboots, causing denial of service.
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 data= 2.6.0.43= 2.6.0.43CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 device modelLocate the switch model number on the physical device label or in the web management interface under 'System' or 'Status' settingsAffected if Device is a NETGEAR JGS516PE or GS116Ev2 switch
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Check firmware versionIn the switch web interface, navigate to 'Maintenance' > 'Firmware Upgrade' or 'System' > 'Device Information' to view the currently installed firmware versionAffected if Firmware version is exactly 2.6.0.43
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Verify TFTP server statusIn the web management interface, check under 'System' > 'TFTP Server' or 'File Management' > 'TFTP' to see if the TFTP server is enabledAffected if TFTP server is enabled on the device
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Assess network exposureReview firewall rules, VLAN configuration, or ACLs to determine if UDP port 69 (TFTP) is accessible from untrusted or external networksAffected if TFTP port 69 is reachable from networks outside the trusted administrative segment
The device is affected if it is a JGS516PE or GS116Ev2 running firmware version 2.6.0.43 with the TFTP server enabled and accessible from an attacker-reachable network segment.
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 available NETGEAR firmware updates for these models; if no update exists, restrict TFTP port access via network segmentation or firewall rules to prevent external attackers from reaching the service.
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-35233 — 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-2020-35233 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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- 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
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