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Rv340 FirmwareOperating system · Cisco

CVE-2021-1415

MEDIUM · 6.3 CVSS v3.1 Published 2021-04-08
Fix available
A fix is available. Upgrade to 1.0.03.21 or later.
See remediation →
69/100
Remediation priority · Elevated
Remotely reachable 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 Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an authenticated, remote attacker to execute arbitrary code with elevated privileges equivalent to the web service process on an affected device. These vulnerabilities exist because HTTP requests are not properly validated. An attacker could exploit these vulnerabilities by sending a crafted HTTP request to the web-based management interface of an affected device. A successful exploit could allow the attacker to remotely execute arbitrary code on the device.

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

This CVE describes code injection vulnerabilities in Cisco RV340-series router web management interfaces where improper HTTP request validation allows authenticated attackers to execute arbitrary code with elevated privileges. The vulnerability stems from lack of input sanitization on HTTP parameters processed by the web service.

MitigationApply Cisco security patches when available; until then, restrict web management interface access to trusted networks only and use strong authentication credentials to reduce attack surface.

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
Rv340 FirmwareOperating system
Affected:< 1.0.03.21
Rv340w FirmwareOperating system
Affected:< 1.0.03.21
Rv345 FirmwareOperating system
Affected:< 1.0.03.21
Rv345p FirmwareOperating system
Affected:< 1.0.03.21

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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

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
    Locate the model number on the device physical label or check via CLI (show version) or web interface. Confirm it is one of: RV340, RV340w, RV345, or RV345p.
    Affected if Model is not one of the four listed (RV340, RV340w, RV345, RV345p), then not affected by this specific CVE.
  2. Check firmware version
    Access the web management interface and navigate to Status > System Summary, or run 'show version' via CLI. Locate the firmware or software version field.
    Affected if Firmware version is less than 1.0.03.21 (e.g., 1.0.03.20, 1.0.02.x, etc.) - the environment is potentially affected.
  3. Verify web management interface status
    Check router configuration for HTTP/HTTPS management access. In web UI, go to Administration > Management or use CLI: 'show http server' or 'show running-config | include http'
    Affected if HTTP or HTTPS management interface is enabled and accessible (even from localhost), making the vulnerability exploitable if authentication is obtained.
  4. Confirm management access scope
    Review the management access settings to determine if the web interface is reachable from untrusted networks. Check ACLs or management VLAN settings.
    Affected if Web management is accessible from WAN or untrusted networks rather than only from LAN/trusted interfaces, increasing exposure to unauthenticated attackers who may obtain credentials.

A user is affected if they own an RV340, RV340w, RV345, or RV345p router running firmware version below 1.0.03.21 with the web 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.

From vendor data
Upgrade available Upgrade to 1.0.03.21 or later
Fixed in 1.0.03.21
Interim mitigation

Apply Cisco security patches when available; until then, restrict web management interface access to trusted networks only and use strong authentication credentials to reduce attack surface.

Fix this in Rv340 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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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

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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-2021-1415 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