Ip Phone 6871 FirmwareOperating system · Cisco
CVE-2023-20079
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 certain Cisco IP Phones could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.
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 · moderate confidenceMultiple vulnerabilities exist in the web-based management interface of Cisco IP Phones that allow unauthenticated remote attackers to execute arbitrary code or cause denial of service. These vulnerabilities stem from insufficient input validation and access controls in the phone's HTTP service.
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 6871 FirmwareOperating system
< 11.3.7sr1
Ip Phone 6861 FirmwareOperating system
< 11.3.7sr1
Ip Phone 6851 FirmwareOperating system
< 11.3.7sr1
Ip Phone 6841 FirmwareOperating system
< 11.3.7sr1
Ip Phone 6825 FirmwareOperating system
< 11.3.7sr1
Ip Phone 7861 FirmwareOperating system
< 11.3.7sr1
Ip Phone 7841 FirmwareOperating system
< 11.3.7sr1
Ip Phone 7832 FirmwareOperating system
< 11.3.7sr1CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 your Cisco IP Phone modelCheck the physical device label on the phone, or access the phone's status menu via the display screen to view the model number.Affected if The model is one of: 6871, 6861, 6851, 6841, 6825, 7861, 7841, or 7832.
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Determine the installed firmware versionAccess the phone's web interface (if enabled) and navigate to the About page, or press the Settings button on the phone and look for Firmware Version in the status information.Affected if The firmware version is lower than 11.3.7sr1.
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Check if the HTTP web-based management interface is enabledAccess the phone's web interface and navigate to Administration > Web Server, or check the phone's settings menu for HTTP/HTML server configuration.Affected if The web-based management interface (HTTP server) is enabled and accessible.
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Verify network exposure of the management interfaceCheck if the phone's HTTP service is bound to all interfaces or is accessible from untrusted networks. Review network segmentation and firewall rules applied to the phone's VLAN.Affected if The web interface is reachable from outside the trusted management network or from untrusted VLANs.
You are affected if you have one of the listed phone models running firmware below 11.3.7sr1 AND the web-based management interface is enabled and accessible.
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 · scoped11.3.7sr1
Apply Cisco firmware updates for affected IP Phone models immediately; if patches are unavailable, disable or restrict access to the web-based management interface via network segmentation or firewall rules.
Cisco IP Phone firmware 11.3.7sr1 or later for models 6825, 6832, 6841, 6851, 6861, 6871, 7832, 7841, 7861
- Identify the specific Cisco IP Phone model from the affected list (6825, 6832, 6841, 6851, 6861, 6871, 7832, 7841, 7861)
- Access the Cisco IP Phone administration interface or Cisco Unified Communications Manager
- Navigate to the firmware management section
- Upload and install firmware version 11.3.7sr1 or later
- Verify the firmware upgrade was successful by checking the firmware version on the phone
- Restart the IP Phone if required to complete the installation
- Confirm the web-based management interface is accessible after upgrade
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Ip Phone 6871 Firmware
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 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 $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-20079 — 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-2023-20079 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
- No spam, self-promotion, credentials, or personal data