CVE-2021-1379: Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) impleme
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Routine
MEDIUM 6.5MITIGATEMITIGATEMITIGATE
CVE-2021-1379 is a medium-severity flaw (CVSS 6.5) affecting ip conference phone 7832 firmware, ip conference phone 7832 with multiplatform firmware, ip conference phone 8832 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Multiple 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 vulnerabil
Why this priority
No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
cisco ip conference phone 7832 firmware MITIGATE
Affected: < 12.8\(1\) · 12.8\(1\)
Fixed in: 12.8\(1\)
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
cisco ip conference phone 7832 with multiplatform firmware MITIGATE
Affected: < 11.3\(2\)
Fixed in: 11.3\(2\)
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
cisco ip conference phone 8832 firmware MITIGATE
Affected: < 12.8\(1\) · 12.8\(1\)
Fixed in: 12.8\(1\)
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
cisco ip conference phone 8832 with multiplatform firmware MITIGATE
Affected: < 11.3\(2\)
Fixed in: 11.3\(2\)
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
cisco ip phone 6821 with multiplatform firmware MITIGATE
Affected: < 11.3\(2\)
Fixed in: 11.3\(2\)
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
cisco ip phone 6841 with multiplatform firmware MITIGATE
Affected: < 11.3\(2\)
Fixed in: 11.3\(2\)
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official sourceNVD · CVE Program · Report a problem with this page Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-1379?
ip conference phone 7832 firmware: mitigate or apply the listed mitigation; ip conference phone 7832 with multiplatform firmware: mitigate or apply the listed mitigation; ip conference phone 8832 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-1379 being exploited?
CVE-2021-1379 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-1379 affect?
CVE-2021-1379 affects ip conference phone 7832 firmware, ip conference phone 7832 with multiplatform firmware, ip conference phone 8832 firmware. Severity is medium (CVSS 6.5). Multiple 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
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