Ip Conference Phone 7832 FirmwareOperating system · Cisco
CVE-2021-1379
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 Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) implementations for Cisco IP Phone Series 68xx/78xx/88xx could allow an unauthenticated, adjacent attacker to execute code remotely or cause a reload of an affected IP phone. These vulnerabilities are due to missing checks when the IP phone processes a Cisco Discovery Protocol or LLDP packet. An attacker could exploit these vulnerabilities by sending a malicious Cisco Discovery Protocol or LLDP packet to the targeted IP phone. A successful exploit could allow the attacker to execute code on the affected IP phone or cause it to reload unexpectedly, resulting in a denial of service (DoS) condition.Note: Cisco Discovery Protocol is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).Cisco has released software updates that address these vulnerabilities. There are no workarounds that 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 confidenceMultiple vulnerabilities in Cisco Discovery Protocol (CDP) and LLDP packet processing for Cisco IP Phone 68xx/78xx/88xx series allow an unauthenticated adjacent attacker to execute arbitrary code or cause device reload. The vulnerabilities stem from missing input validation checks when the IP phone parses malformed CDP or LLDP packets, which can trigger buffer overflows or other memory corruption conditions.
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 Conference Phone 7832 FirmwareOperating system
< 12.8\(1\)= 12.8\(1\)
Ip Conference Phone 7832 With Multiplatform FirmwareOperating system
< 11.3\(2\)
Ip Conference Phone 8832 FirmwareOperating system
< 12.8\(1\)= 12.8\(1\)
Ip Conference Phone 8832 With Multiplatform FirmwareOperating system
< 11.3\(2\)
Ip Phone 6821 With Multiplatform FirmwareOperating system
< 11.3\(2\)
Ip Phone 6841 With Multiplatform FirmwareOperating system
< 11.3\(2\)
Ip Phone 6851 With Multiplatform FirmwareOperating system
< 11.3\(2\)
Ip Phone 6861 With Multiplatform FirmwareOperating system
< 11.3\(2\)CVSS 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
- Adjacent
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:A/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 the Cisco IP phone modelLocate the model number on the physical device (usually on a label on the bottom or back) or access the phone's web interface or admin menu to view the device informationAffected if The model is one of: 6821, 6841, 6851, 6861, 7832, or 8832
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Determine the installed firmware versionAccess the phone's admin interface via web browser (http://<phone-ip>/) or the phone's Settings menu to view the firmware version under Device Information or Software VersionAffected if The firmware version is < 12.8(1) or = 12.8(1) for 7832/8832 (regular firmware), or < 11.3(2) for any multiplatform firmware variant (6821, 6841, 6851, 6861, 7832, 8832)
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Identify if using multiplatform firmwareCheck the firmware variant in the phone's admin interface or release notes - multiplatform firmware is specifically labeled as 'With Multiplatform Firmware' in the product namingAffected if The device runs multiplatform firmware versions < 11.3(2)
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Verify CDP or LLDP protocol is enabledAccess the phone's web interface or admin menu and check Network Settings or Port Settings for CDP (Cisco Discovery Protocol) and LLDP (Link Layer Discovery Protocol) settingsAffected if CDP or LLDP is enabled on the device - the vulnerability only triggers when the phone processes these specific packet types
The device is affected if it is a Cisco IP Phone 6832, 7832, 8832, 6821, 6841, 6851, or 6861 running firmware versions within the affected ranges AND CDP or LLDP is enabled, since exploitation requires malformed CDP/LLDP packets to be processed.
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 data11.312.8
Apply Cisco's software updates to affected IP phone firmware. There are no available workarounds. Since exploitation requires Layer 2 adjacency, ensure untrusted devices cannot access the same broadcast domain.
Fix this in Ip Conference Phone 7832 Firmware
Scoped from the published advisory
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1379 — 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-2021-1379 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
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