dbcve.org
Re6500 FirmwareOperating system · Linksys

CVE-2020-35713

CRITICAL · 9.8 CVSS v3.1 Published 2020-12-26
Fix available
A fix is available. Upgrade to 1.0.012.001 or later.
See remediation →
100/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click

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 · unedited
Belkin LINKSYS RE6500 devices before 1.0.012.001 allow remote attackers to execute arbitrary commands or set a new password via shell metacharacters to the goform/setSysAdm page.

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
How this class of weakness works · CWE-78

User input reaches a shell or system command without being fully separated from the command itself, so an attacker can append their own instructions. Because these run with the application's privileges, it often means full control of the host. The lasting fix is to avoid the shell entirely — call APIs directly and pass arguments as data, never as concatenated strings.

General guidance for the os command injection class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Re6500 FirmwareOperating system
Affected:< 1.0.012.001

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
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

dbcve · scoped
Upgrade available Upgrade to 1.0.012.001 or later
Fixed in 1.0.012.001
Recommended fix High confidence

Linksys RE6500 Firmware 1.0.012.001 or later

  1. Download the Linksys RE6500 firmware version 1.0.012.001 or later from the official Linksys support site (downloads.linksys.com or linksys.com/support)
  2. Log in to the RE6500 web interface by entering the device IP address in a browser
  3. Navigate to Administration > Firmware Upgrade
  4. Click Browse/Choose File and select the downloaded firmware file
  5. Click Upload or Upgrade to begin the firmware installation
  6. Wait for the firmware to upload and install - do not power off the device
  7. After the device reboots, log back into the web interface
  8. Verify the firmware version under Administration > Firmware Upgrade shows 1.0.012.001 or later

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $3,550. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2020-35713 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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