Rv016 Multi Wan Vpn Router FirmwareOperating system · Cisco
CVE-2021-1320
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 confidenceCommand injection vulnerabilities in the web-based management interface of Cisco Small Business RV series routers (RV016, RV042, RV042G, RV082, RV320, RV325) allow authenticated attackers with administrator credentials to execute arbitrary code as root or cause device reload via crafted HTTP requests due to improper input validation.
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 router modelAccess the device web interface and navigate to System Summary or Status page to confirm the exact model number (RV016, RV042, RV042G, RV082, RV320, or RV325). Alternatively, check the physical device label or use SNMP to query device information.Affected if The device is one of: RV016, RV042, RV042G, RV082, RV320, or RV325.
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Check firmware versionLog into the web-based management interface and navigate to Administration > Firmware Upgrade or System Summary to view the currently installed firmware version. Compare against the affected versions: RV016/RV042/RV042G/RV082 if version <= 4.2.3.14; RV320/RV325 if version <= 1.5.1.11.Affected if Firmware version is at or below 4.2.3.14 for RV016/RV042/RV042G/RV082, or at or below 1.5.1.11 for RV320/RV325.
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Verify web-based management interface is enabledIn the web interface, go to Administration > Management or Security settings and confirm the HTTP/HTTPS management interface is enabled. Check if access is allowed from WAN (remote) or LAN only.Affected if The web-based management interface is enabled and accessible.
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Confirm remote admin access configurationNavigate to Administration > Remote Management or Security > Access Rules to determine if remote (WAN) access to the web management interface is permitted. Note the IP ranges or interfaces allowed for administrative access.Affected if Remote WAN access to the web interface is enabled, exposing the device to external attackers.
The device is affected if it is an RV016, RV042, RV042G, RV082, RV320, or RV325 router running firmware at or below the affected version AND the web-based management interface is enabled, particularly if accessible from WAN.
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 available Cisco firmware patches; if no patch exists, restrict administrative access to trusted networks only or disable remote web management interface access.
Fix this in Rv016 Multi Wan Vpn Router Firmware
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,800.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1320 — 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-2021-1320 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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- 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
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