Rv016 FirmwareOperating system · Cisco
CVE-2020-3277
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 RV320 and RV325 Series Routers and Cisco Small Business RV016, RV042, and RV082 Routers could allow an authenticated, remote attacker with administrative privileges to execute arbitrary commands on an affected device. The vulnerabilities exist because the web-based management interface does not properly validate user-supplied input to scripts. An attacker with administrative privileges that are sufficient to log in to the web-based management interface could exploit each vulnerability by sending malicious requests to an affected device. A successful exploit could allow the attacker to execute arbitrary commands with root privileges on the underlying operating system.
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 vulnerability in the web-based management interface of Cisco Small Business RV016, RV042, RV082, RV320, and RV325 routers. An authenticated attacker with administrative privileges can send malicious requests containing unsanitized input to scripts, enabling arbitrary command execution with root privileges on the underlying operating system.
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 FirmwareOperating system
<= 4.2.3.10
Rv042 FirmwareOperating system
<= 4.2.3.10
Rv042g FirmwareOperating system
<= 4.2.3.10
Rv082 FirmwareOperating system
<= 4.2.3.10
Rv320 FirmwareOperating system
<= 1.5.1.05
Rv325 FirmwareOperating system
<= 1.5.1.05CVSS 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 modelLocate the model number on the device label or access the web-based management interface and check the Status or Dashboard page for the hardware model (RV016, RV042, RV042g, RV082, RV320, or RV325).Affected if The model is one of RV016, RV042, RV042g, RV082, RV320, or RV325.
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Check firmware versionIn the web-based management interface, navigate to Status > System Summary or Administration > Firmware Upgrade to view the installed firmware version number.Affected if The firmware version is <= 4.2.3.10 for RV016/RV042/RV042g/RV082, or <= 1.5.1.05 for RV320/RV325.
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Verify web-based management is enabledIn the web UI, go to Administration > Management or Security > Access Settings and confirm the HTTP/HTTPS management interface is enabled.Affected if Web-based management is enabled on any interface (LAN or WAN).
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Check if remote WAN management is enabledIn the web UI, go to Security > Access Settings or Administration > Management and determine if HTTP/HTTPS access is permitted from the WAN (remote) side.Affected if Remote management access from WAN is enabled, exposing the interface to external attackers.
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Review admin accounts for unauthorized changesIn the web UI, go to Administration > User Accounts or Administration > Admin Access and verify only expected administrative accounts exist with no unauthorized additions.Affected if Unexpected admin accounts or configuration changes are present.
The environment is affected if the router model is one of the listed products and the firmware version falls within the affected ranges, especially if web-based management is accessible from the WAN side.
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-provided security patches from Cisco. Restrict access to the web-based management interface to trusted networks only, and consider disabling remote management if not required.
Fix this in Rv016 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-2020-3277 — 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-2020-3277 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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