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Small Business Rv Series Router FirmwareOperating system · Cisco

CVE-2021-1609

CRITICAL · 9.8 CVSS v3.1 Published 2021-08-04
Fix available
A fix is available. Upgrade to 1.0.03.22 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
Multiple vulnerabilities in the web-based management interface of the Cisco Small Business RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an attacker to do the following: Execute arbitrary code Cause a denial of service (DoS) condition Execute arbitrary commands For more information about these vulnerabilities, see the Details section of this advisory.

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 confidence

Multiple critical vulnerabilities in the web-based management interface of Cisco Small Business RV340, RV340W, RV345, and RV345P VPN routers allow remote attackers to execute arbitrary code, cause denial of service, or run arbitrary commands on the affected devices.

MitigationApply the Cisco firmware update for these models when released; in the interim, disable remote web management access or restrict it to trusted IP addresses via ACLs.

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
Small Business Rv Series Router FirmwareOperating system
Affected:< 1.0.03.22

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 router model
    Access the device web UI or CLI and confirm the model is RV340, RV340W, RV345, or RV345P
    Affected if Model is one of these four models and the web management interface is accessible
  2. Check firmware version
    Navigate to the web UI Status page or use 'show version' command via CLI to retrieve the firmware version
    Affected if Firmware version is lower than 1.0.03.22 (for example, 1.0.03.20, 1.0.02.15, etc.)
  3. Verify web management interface status
    Go to Administration > Web Management in the router UI or check via CLI for service status
    Affected if Web-based management interface is enabled and accessible from WAN or untrusted networks
  4. Check remote access configuration
    Review the Access Control settings under Administration to see if web management is restricted to specific IP addresses or if it allows external access
    Affected if Web management is accessible from any remote IP address (0.0.0.0/0) or from WAN interface without ACL restrictions

The device is affected if it is an RV340, RV340W, RV345, or RV345P router running firmware version prior to 1.0.03.22 with the web-based management interface 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 1.0.03.22 or later
Fixed in 1.0.03.22
Interim mitigation

Apply the Cisco firmware update for these models when released; in the interim, disable remote web management access or restrict it to trusted IP addresses via ACLs.

Recommended fix High confidence

Firmware version 1.0.03.22 or later for Cisco Small Business RV340/RV340W/RV345/RV345P routers

  1. 1. Identify the current firmware version by logging into the router web interface and navigating to Administration > Firmware Upgrade, or by checking the status page
  2. 2. Download the firmware version 1.0.03.22 or later from the Cisco software download center (tools.cisco.com) for your specific router model (RV340, RV340W, RV345, or RV345P)
  3. 3. Access the router's web-based management interface and navigate to Administration > Firmware Upgrade
  4. 4. Click the firmware upload button and select the downloaded firmware file (.img or .bin)
  5. 5. Wait for the upload to complete - do not power off the router during this process
  6. 6. The router will automatically reboot after the firmware is applied
  7. 7. After reboot, verify the new firmware version is showing as 1.0.03.22 or later in the router status
Caveat Review Cisco release notes for any configuration changes or feature modifications between your current version and 1.0.03.22; backup router configuration before upgrading

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

Fix this in Small Business Rv Series Router Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation4.0 h
  • Testing3.0 h
  • Review / QA2.0 h
12.0 hours of engineering $2,130
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.

Scan for this in your stack

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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-2021-1609 in production — separate from our analysis above.

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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