Ip Phone 7800 FirmwareOperating system · Cisco
CVE-2023-20018
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 · uneditedA vulnerability in the web-based management interface of Cisco IP Phone 7800 and 8800 Series Phones could allow an unauthenticated, remote attacker to bypass authentication on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface. A successful exploit could allow the attacker to access certain parts of the web interface that would normally require authentication.
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 confidenceAuthentication bypass vulnerability in the web-based management interface of Cisco IP Phone 7800 and 8800 Series. The flaw stems from insufficient validation of user-supplied input, allowing unauthenticated remote attackers to send crafted HTTP requests that bypass authentication mechanisms and access restricted areas of the web interface.
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
Ip Phone 7800 FirmwareOperating system
< 14.1\(1\)sr2
Ip Phone 7811 FirmwareOperating system
< 14.1\(1\)sr2
Ip Phone 7821 FirmwareOperating system
< 14.1\(1\)sr2
Ip Phone 7832 FirmwareOperating system
< 14.1\(1\)sr2
Ip Phone 7841 FirmwareOperating system
< 14.1\(1\)sr2
Ip Phone 7861 FirmwareOperating system
< 14.1\(1\)sr2
Ip Phone 8800 FirmwareOperating system
< 14.1\(1\)sr2
Ip Phone 8811 FirmwareOperating system
< 14.1\(1\)sr2CVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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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Verify web-based management interface is enabledCheck the phone's web server status via its menu (Settings > Admin Settings > Web Server) or through Cisco Call Manager/Unity Connection administration console. Alternatively, scan the phone's IP address for open HTTP/HTTPS ports (typically 80/443 or 8080/8443).Affected if The web-based management interface is accessible on the network (ports 80, 443, 8080, or 8443 are open on the phone).
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Obtain the firmware versionAccess the phone's web interface and navigate to the Info page, or go to the phone's screen menu (Settings > Model Information > Firmware Version), or query via Cisco Call Manager Device Report. The version typically appears as a string like 14.1(1)sr1 or similar.Affected if The installed firmware version cannot be determined or is visible in the interface.
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Compare version against affected rangeCompare your installed firmware version to the affected threshold: versions earlier than 14.1(1)sr2 are vulnerable. For example, 14.1(1), 14.0(1), 13.x, or any build numbered below 14.1(1)sr2 indicate the device is in the affected range.Affected if The firmware version is 14.1(1)sr1, 14.1(1), 14.0(x), or any version earlier than 14.1(1)sr2.
If the phone has its web-based management interface exposed on the network AND runs firmware version earlier than 14.1(1)sr2, the device is vulnerable to this authentication bypass.
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 · scoped14.1
Apply the vendor-supplied firmware update from Cisco to affected devices. As an interim measure, disable or restrict access to the web-based management interface via network segmentation or firewall rules.
14.1(1)sr2 or later
- Obtain the fixed firmware version 14.1(1)sr2 or later from Cisco's official download site
- Access the phone's web-based management interface or Cisco Unified Communications Manager administration console
- Navigate to the firmware upgrade or device provisioning section
- Upload and apply the firmware to each affected IP Phone model (7800, 7811, 7821, 7832, 7841, 7861, 8800, 8811)
- After the upgrade completes, verify the firmware version is 14.1(1)sr2 or higher by checking the phone's status or administration page
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Ip Phone 7800 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-2023-20018 — 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-2023-20018 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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