Rv016 Multi Wan Vpn Router FirmwareOperating system · Cisco
CVE-2021-1342
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 · uneditedMultiple vulnerabilities in the web-based management interface of Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 Routers could allow an authenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly. These 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.
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 confidenceMultiple input validation vulnerabilities in the web-based management interface of Cisco Small Business RV series routers allow authenticated administrators to inject arbitrary commands via crafted HTTP requests, leading to root-level code execution or device DoS through reload.
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
Rv016 Multi Wan Vpn Router FirmwareOperating system
<= 4.2.3.14
Rv042 Dual Wan Vpn Router FirmwareOperating system
<= 4.2.3.14
Rv042g Dual Gigabit Wan Vpn Router FirmwareOperating system
<= 4.2.3.14
Rv082 Dual Wan Vpn Router FirmwareOperating system
<= 4.2.3.14
Rv320 Dual Gigabit Wan Vpn Router FirmwareOperating system
<= 1.5.1.11
Rv325 Dual Gigabit Wan Vpn Router FirmwareOperating system
<= 1.5.1.11CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify the router modelLocate the Cisco Small Business RV series router in your network inventory or physically inspect the device label. Common model numbers include RV016, RV042, RV042G, RV082, RV320, and RV325.Affected if The device is one of the listed affected models (RV016, RV042, RV042G, RV082, RV320, or RV325).
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Determine the installed firmware versionAccess the router web-based management interface and navigate to the System Summary or Status page to view the firmware version. Alternatively, use the router CLI and run the 'show version' command.Affected if The firmware version is at or below 4.2.3.14 for RV016/RV042/RV042G/RV082 models, or at or below 1.5.1.11 for RV320/RV325 models.
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Verify if the web-based management interface is enabledLog into the router web interface and check the Administration or Management settings to confirm whether the HTTP/HTTPS management interface is currently enabled.Affected if The web-based management interface is enabled. This is the attack vector required for exploitation.
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Check management interface network exposureReview the router's access control settings or firewall rules to determine if the management interface is reachable from untrusted networks (such as the internet or guest networks).Affected if The management interface is accessible from untrusted networks rather than being restricted to a trusted management VLAN or specific admin IP range.
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Review administrator account securityExamine the list of administrator accounts configured on the router to assess password strength and account management practices.Affected if Weak or default administrator credentials are in use, making it easier for an attacker to gain the authenticated access required to exploit this vulnerability.
You are affected if you run any of the listed RV series router models with firmware at or below the specified version limits AND have the web-based management interface enabled and accessible.
Generated from the published advisory. Verify against your own configuration.
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 dataApply Cisco-provided patches immediately. Until patched, restrict management interface access to trusted networks using ACLs, enforce strong administrator credentials, and monitor for anomalous HTTP requests.
Fix this in Rv016 Multi Wan Vpn Router Firmware
Scoped from the published advisory
- Consultation4.0 h
- Implementation12.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $7,808.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1342 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-1342 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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