Rv320 FirmwareOperating system · Cisco
CVE-2023-20128
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 Dual Gigabit WAN VPN Routers could allow an authenticated, remote attacker to inject and execute arbitrary commands on the underlying operating system of an affected device. These vulnerabilities are due to insufficient validation of user-supplied input. An attacker could exploit these vulnerabilities by sending malicious input to an affected device. A successful exploit could allow the attacker to execute arbitrary commands as the root user on the underlying Linux operating system of the affected device. To exploit these vulnerabilities, an attacker would need to have valid Administrator credentials on the affected device. Cisco has not released software updates to 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 confidenceCommand injection vulnerabilities in the web-based management interface of Cisco RV320 and RV325 routers allow authenticated attackers with Administrator credentials to inject and execute arbitrary Linux commands as root due to insufficient input validation on user-supplied parameters.
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
Rv320 FirmwareOperating system
all versions
Rv325 FirmwareOperating system
all versionsCVSS 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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Confirm device is Cisco RV320 or RV325Access the router web interface and navigate to Status > System Summary, or log in via SSH and run 'show version' to identify the hardware modelAffected if Device model is Cisco RV320 or RV325 (all firmware versions are affected)
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Verify web-based management interface is enabledIn the router web UI, go to Administration > Management and confirm the 'HTTP' or 'HTTPS' web server is enabledAffected if Web management interface is enabled on the device
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Check if management interface is exposed to untrusted networksReview firewall/access settings to determine if the web management port (HTTP/HTTPS) is bound to WAN or an outside interface, or check port forwarding/NAT rules that expose port 80/443 externallyAffected if Web management interface is accessible from WAN or untrusted networks rather than LAN-only
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Assess remote administrative access methodsGo to Administration > Remote Management and check if 'Remote Management' is enabled, or verify VPN configuration for remote admin accessAffected if Remote management or VPN access is configured allowing administrators to access the web UI from outside the local network
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Review administrator account accessibilityConfirm that administrator credentials exist and are in use; note that the vulnerability requires valid Administrator-level credentialsAffected if At least one administrator account is active on the device (required for exploitation)
If the device is a Cisco RV320 or RV325 with web-based management enabled and accessible from untrusted networks, and an attacker can obtain Administrator credentials, the environment is vulnerable to CVE-2023-20128 command injection.
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.
dbcve · scopedSince Cisco has not released patches, implement compensating controls: restrict management interface to trusted networks only, require VPN for remote administrative access, disable external management exposure, and consider hardware replacement given end-of-life status.
- No vendor-provided patch, upgrade, or configuration mitigation is available for this CVE.
- Monitor Cisco security advisories (sec.cloudapps.cisco.com) for any future firmware releases addressing these vulnerabilities.
- Implement network segmentation to limit exposure of the management interface to trusted networks only.
- If alternative hardware is feasible, consider migrating to a currently supported Cisco small business router model.
- Enforce strong, unique Administrator credentials and consider implementing IP-based access restrictions on the management interface.
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Rv320 Firmware
Scoped from the published advisory
- Consultation8.0 h
- Implementation12.0 h
- Testing6.0 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 $8,608.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-20128 — 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-2023-20128 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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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.
- 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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