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Rv110w Wireless N Vpn Firewall FirmwareOperating system · Cisco

CVE-2020-3331

CRITICAL · 9.8 CVSS v3.1 Published 2020-07-16
Fix available
A fix is available. Upgrade to 1.2.2.8 / 1.3.1.7 or later.
See remediation →
100/100
Remediation priority · Urgent
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
A vulnerability in the web-based management interface of Cisco RV110W Wireless-N VPN Firewall and Cisco RV215W Wireless-N VPN Router could allow an unauthenticated, remote attacker to execute arbitrary code on an affected device. The vulnerability is due to improper validation of user-supplied input data by the web-based management interface. An attacker could exploit this vulnerability by sending crafted requests to a targeted device. A successful exploit could allow the attacker to execute arbitrary code with the privileges of the root user.

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 confidence

A command injection vulnerability in the web-based management interface of Cisco RV110W and RV215W routers allows unauthenticated remote attackers to execute arbitrary code with root privileges due to improper input validation. The attacker sends specially crafted HTTP requests to the web interface.

MitigationApply available firmware updates from Cisco; if no update exists (end-of-life devices), replace with supported hardware and implement network segmentation to isolate legacy devices.

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
Rv110w Wireless N Vpn Firewall FirmwareOperating system
Affected:< 1.2.2.8
Rv215w Wireless N Vpn Router FirmwareOperating system
Affected:< 1.3.1.7

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

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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify the router model
    Log into the router web interface and check the device status page, or check the physical device label for model number (RV110W or RV215W)
    Affected if Device is a Cisco RV110W or RV215W router
  2. Check the firmware version
    In the router web interface, navigate to Administration > Firmware Upgrade or Status page to view the installed firmware version
    Affected if Firmware version is below 1.2.2.8 for RV110W or below 1.3.1.7 for RV215W
  3. Verify web-based management interface is enabled
    In the router web interface, go to Administration > Management and check if HTTP/HTTPS management access is enabled
    Affected if HTTP or HTTPS web management interface is enabled (the vulnerability is in the web interface)
  4. Check network exposure of the web interface
    Review firewall rules or port forwarding configurations to determine if the router web interface (ports 80/443) is exposed to the internet or untrusted networks
    Affected if The router web management interface is accessible from untrusted networks (internet-facing)

The device is affected if it is a Cisco RV110W with firmware < 1.2.2.8 or RV215W with firmware < 1.3.1.7, and the web-based management interface is enabled and accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 1.2.2.8 / 1.3.1.7 or later
Fixed in 1.2.2.81.3.1.7
Interim mitigation

Apply available firmware updates from Cisco; if no update exists (end-of-life devices), replace with supported hardware and implement network segmentation to isolate legacy devices.

Recommended fix High confidence

RV110W: upgrade to firmware 1.2.2.8; RV215W: upgrade to firmware 1.3.1.7

  1. Download the fixed firmware version 1.2.2.8 for RV110W or 1.3.1.7 for RV215W from the Cisco software download center (software.cisco.com) or official Cisco support portal
  2. Access the web-based management interface of the affected Cisco RV110W or RV215W device
  3. Navigate to the Administration or System section of the web interface
  4. Locate the Firmware Upgrade or Software Update option
  5. Upload the downloaded fixed firmware file to the device
  6. Wait for the firmware upload and installation to complete - do not power off the device during this process
  7. After the device reboots, verify the firmware version has been updated to 1.2.2.8 (RV110W) or 1.3.1.7 (RV215W)
  8. Verify that the web interface is accessible and the device is functioning normally
Caveat Firmware upgrades may reset some configurations to defaults; back up current configuration before upgrading and re-apply after upgrade if needed

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

Fix this in Rv110w Wireless N Vpn Firewall Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2020-3331 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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