dbcve.org
Rv110w FirmwareOperating system · Cisco

CVE-2021-1459

CRITICAL · 9.8 CVSS v3.1 Published 2021-04-08
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
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 Small Business RV110W, RV130, RV130W, and RV215W Routers 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 in the web-based management interface. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system of the affected device. Cisco has not released software updates that address this vulnerability.

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

Improper input validation in the web-based management interface of Cisco Small Business RV110W, RV130, RV130W, and RV215W routers allows unauthenticated remote attackers to inject and execute arbitrary code via specially crafted HTTP requests, achieving root-level code execution on the underlying Linux-based OS.

MitigationSince Cisco has not released patches (EoL device), implement compensating controls: disable the web management interface on WAN-facing interfaces, place devices behind a firewall, and/or replace with supported hardware; monitor for exploitation attempts via IDS/IPS.

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 FirmwareOperating system
Affected:= 1.0.3.55
Rv130 FirmwareOperating system
Affected:= 1.0.3.55
Rv130w FirmwareOperating system
Affected:= 1.0.3.55
Rv215w FirmwareOperating system
Affected:= 1.0.3.55

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
    Access the router's web-based management interface and navigate to the Status or System Summary page to confirm the exact model number (RV110W, RV130, RV130W, or RV215W). Alternatively, check the physical device label or use the CLI command 'show version'.
    Affected if The device is a Cisco RV110W, RV130, RV130W, or RV215W router.
  2. Check the firmware version
    In the router's web UI, go to System Summary or Administration > Firmware Upgrade to view the installed firmware version. The affected version is 1.0.3.55 exactly.
    Affected if The installed firmware version is 1.0.3.55.
  3. Confirm web management interface is enabled
    In the router's web UI, navigate to Firewall > Access Rules or Administration > Management Access to verify if HTTP/HTTPS management is enabled. Check both LAN and WAN settings.
    Affected if The web-based management interface (HTTP or HTTPS) is enabled on any interface.
  4. Verify WAN-facing management exposure
    In the web UI under Firewall > Access Rules or Administration > Management Access, check if HTTP/HTTPS management is permitted on the WAN interface (Internet-facing). This is often labeled as 'WAN' or 'Internet' in the access rules.
    Affected if Web management is enabled and accessible from the WAN (Internet) interface.

You are affected if you are running firmware version 1.0.3.55 on an RV110W, RV130, RV130W, or RV215W router with the web management interface enabled, especially if exposed to the WAN.

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
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Since Cisco has not released patches (EoL device), implement compensating controls: disable the web management interface on WAN-facing interfaces, place devices behind a firewall, and/or replace with supported hardware; monitor for exploitation attempts via IDS/IPS.

Fix this in Rv110w 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-2021-1459 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