dbcve.org
Rv110w FirmwareOperating system · Cisco

CVE-2021-1209

HIGH · 7.2 CVSS v3.1 Published 2021-01-13
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
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 Small Business RV110W, RV130, RV130W, and RV215W Routers could allow an authenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly. The vulnerabilities are due to improper validation of user-supplied input in the web-based management interface. An attacker could exploit these vulnerabilities by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system or cause the device to reload, resulting in a denial of service (DoS) condition. To exploit these vulnerabilities, an attacker would need to have valid administrator credentials on the affected device. Cisco has not released software updates that address these vulnerabilities.

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

Multiple input validation vulnerabilities in the web-based management interface of Cisco Small Business RV series routers (RV110W, RV130, RV130W, RV215W) allow an authenticated administrator to send crafted HTTP requests that result in arbitrary code execution as root user or device reload/DoS. The vulnerabilities stem from insufficient sanitization of user input in the management web interface.

MitigationSince Cisco has not released patches, mitigate by restricting access to the router's web management interface to internal/trusted networks only, implementing VPN access for administrative tasks, and considering hardware replacement if the device is end-of-life. Network-based access control lists (ACLs) should block external access to management ports.

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:= 1.2.2.8= 1.3.1.7
Rv130 Vpn Router FirmwareOperating system
Affected:= 1.2.2.8= 1.3.1.7
Rv130w FirmwareOperating system
Affected:= 1.2.2.8= 1.3.1.7
Rv215w Wireless N Vpn Router FirmwareOperating system
Affected:= 1.2.2.8= 1.3.1.7
Application Extension PlatformPlugin / extension
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
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/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 device's web management interface and check the System Status or Device Info page, or use the serial console to view the model number during boot. The affected models are RV110W, RV130, RV130W, RV215W.
    Affected if The device model is any of RV110W, RV130, RV130W, or RV215W.
  2. Check the firmware version
    In the web interface, navigate to Status > System Summary or Administration > Firmware Upgrade to view the currently installed firmware version. Compare against the affected versions: 1.2.2.8 or 1.3.1.7 for the RV series, or 1.0.3.55 for Application Extension Platform.
    Affected if The installed firmware version matches exactly 1.2.2.8, 1.3.1.7 (RV series), or 1.0.3.55 (AXP).
  3. Verify if web-based management is enabled
    In the web interface, go to Administration > Management > HTTP/HTTPS Configuration, or on the main menu look for Remote Management settings. Check if HTTP or HTTPS management access is enabled.
    Affected if HTTP or HTTPS management access is enabled on any interface (LAN or WAN).
  4. Confirm web management is accessible from untrusted networks
    Check the Remote Management settings to determine which interfaces (LAN/WAN) can access the web management interface. Look for any WAN-facing HTTP/HTTPS access or verify firewall rules that permit external access to ports 80/443.
    Affected if The web management interface is reachable from WAN or untrusted networks, or Remote Management is enabled without IP restrictions.

A user is affected if they run any of the specific firmware versions (1.2.2.8, 1.3.1.7, or 1.0.3.55) on the listed models AND the web-based management interface is accessible to them or their network.

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, mitigate by restricting access to the router's web management interface to internal/trusted networks only, implementing VPN access for administrative tasks, and considering hardware replacement if the device is end-of-life. Network-based access control lists (ACLs) should block external access to management ports.

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-2021-1209 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