CVE-2024-28066: In Unify CP IP Phone firmware 1.10.4.3, Weak Credentials are used (a hardcoded root password).

Q: How do I fix CVE-2024-28066?

6940w firmware: upgrade to 1.11.3.0; 6930w firmware: upgrade to 1.11.3.0; 6920w firmware: upgrade to 1.11.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2024-28066 being exploited?

CVE-2024-28066 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2024-28066 affect?

CVE-2024-28066 affects 6940w firmware, 6930w firmware, 6920w firmware. Severity is high (CVSS 8.8). In Unify CP IP Phone firmware 1.10.4.3, Weak Credentials are used (a hardcoded root password).

Q: How urgent is CVE-2024-28066?

Priority 46/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADEUPGRADEUPGRADE

CVE-2024-28066 is a high-severity flaw (CVSS 8.8) affecting 6940w firmware, 6930w firmware, 6920w firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Unify CP IP Phone firmware 1.10.4.3, Weak Credentials are used (a hardcoded root password).

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-259, CWE-1391
Published	2024-04-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: mitel

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-08 13:15 UTCPublished CVE record published
2026-06-17 07:20 UTCUpdated Record last modified

mitel 6940w firmware UPGRADE

Affected: >= 1.10.4.3 and < 1.11.3.0

Fixed in: 1.11.3.0

Safe to downgrade to: a release before 1.10.4.3

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.

mitel 6930w firmware UPGRADE

Affected: >= 1.10.4.3 and < 1.11.3.0

Fixed in: 1.11.3.0

Safe to downgrade to: a release before 1.10.4.3

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.

mitel 6920w firmware UPGRADE

Affected: >= 1.10.4.3 and < 1.11.3.0

Fixed in: 1.11.3.0

Safe to downgrade to: a release before 1.10.4.3

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.

mitel 6970 firmware UPGRADE

Affected: >= 1.10.4.3 and < 1.11.3.0

Fixed in: 1.11.3.0

Safe to downgrade to: a release before 1.10.4.3

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.

mitel 6915 firmware UPGRADE

Affected: >= 1.10.4.3 and < 1.11.3.0

Fixed in: 1.11.3.0

Safe to downgrade to: a release before 1.10.4.3

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.

mitel 6910 firmware UPGRADE

Affected: >= 1.10.4.3 and < 1.11.3.0

Fixed in: 1.11.3.0

Safe to downgrade to: a release before 1.10.4.3

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 source NVD · 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-2024-28066?

6940w firmware: upgrade to 1.11.3.0; 6930w firmware: upgrade to 1.11.3.0; 6920w firmware: upgrade to 1.11.3.0. Exact commands for each OS are on this page.

Is CVE-2024-28066 being exploited?

CVE-2024-28066 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-2024-28066 affect?

CVE-2024-28066 affects 6940w firmware, 6930w firmware, 6920w firmware. Severity is high (CVSS 8.8). In Unify CP IP Phone firmware 1.10.4.3, Weak Credentials are used (a hardcoded root password).

How urgent is CVE-2024-28066?

Priority 46/100. High severity; Public exploit reference

References

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