Rv016 Multi Wan Vpn Router FirmwareOperating system · Cisco
CVE-2021-1316
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 inject arbitrary commands that are executed with root privileges. 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 a targeted device. A successful exploit could allow the attacker to execute arbitrary code as the root user on the underlying operating system. To exploit these vulnerabilities, an attacker would need to have valid administrator credentials on an 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 confidenceThis is a command injection vulnerability in the web-based management interface of multiple Cisco Small Business router models. An authenticated attacker with administrator credentials can send crafted HTTP requests containing malicious input that is not properly validated, allowing arbitrary OS commands to be executed with root privileges.
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 modelAccess the router's web interface or console and identify the exact model number (Rv016, Rv042, Rv042g, Rv082, Rv320, or Rv325). This is typically displayed on the status page or device label.Affected if The model is any of: Rv016, Rv042, Rv042g, Rv082, Rv320, or Rv325
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Check the firmware versionLog into the web-based management interface and navigate to the Status or System Summary page to view the firmware version. Alternatively, check via CLI if available.Affected if Firmware version is 4.2.3.14 or lower for Rv016/Rv042/Rv042g/Rv082, or 1.5.1.11 or lower for Rv320/Rv325
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Verify web management interface accessibilityDetermine if the HTTP/HTTPS management interface is reachable from the network. Check firewall rules, NAT configurations, and interface binding settings.Affected if The web-based management interface is accessible from untrusted networks (such as the internet or guest networks)
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Review administrator accountsAudit the list of configured administrator accounts on the router to identify any unauthorized or unexpected accounts.Affected if There are unexpected administrator accounts or evidence of credential compromise
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Inspect for signs of command injectionReview router logs, especially web server logs, for suspicious HTTP requests containing shell metacharacters (such as ; | & $ ` or command substitution patterns). Check for unexpected processes or cron jobs on the device if CLI access is available.Affected if Logs show unusual HTTP requests with command syntax, or unexpected processes are running on the device
You are affected if your router model is one of the six listed and your firmware version falls within the vulnerable ranges AND the web management interface is accessible to an attacker.
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 the vendor-supplied firmware update from Cisco to address these vulnerabilities. If updates are unavailable, restrict administrative access to trusted IP addresses only and monitor for suspicious HTTP requests.
Fix this in Rv016 Multi Wan Vpn Router Firmware
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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
Free · runs locallyCheck whether your project pulls in CVE-2021-1316 — 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-2021-1316 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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