CVE-2021-44225: In Keepalived through 2.2.4, the D-Bus policy does not sufficiently restrict the message destination, allowing

Q: How do I fix CVE-2021-44225?

keepalived: upgrade to newer than 2.2.4; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-44225 being exploited?

CVE-2021-44225 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-2021-44225 affect?

CVE-2021-44225 affects keepalived, fedora. Severity is medium (CVSS 5.4). In Keepalived through 2.2.4, the D-Bus policy does not sufficiently restrict the message destination, allowing any user to inspect and manipulate any property. This leads to access-control bypass in some situations in which an unrelated D-B

Q: How urgent is CVE-2021-44225?

Priority 35/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADEMITIGATE

CVE-2021-44225 is a medium-severity flaw (CVSS 5.4) affecting keepalived, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Keepalived through 2.2.4, the D-Bus policy does not sufficiently restrict the message destination, allowing any user to inspect and manipulate any property. This leads to access-control bypass in some situations in which an unrelated D-Bus system service has a settable (writable) property

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Published	2021-11-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · keepalived

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

Am I affected?

Timeline

2021-11-26 00:15 UTCPublished CVE record published
2026-06-17 04:12 UTCUpdated Record last modified

keepalived keepalived UPGRADE

Affected: <= 2.2.4

Fixed in: newer than 2.2.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy keepalived || rpm -q keepalived || keepalived --version

2. UPGRADE to newer than 2.2.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade keepalived

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade keepalived

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

fedoraproject fedora MITIGATE

Affected: 34 · 35

Fixed in: no fixed release known

Safe to downgrade to: a release before 34

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-2021-44225?

keepalived: upgrade to newer than 2.2.4; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-44225 being exploited?

CVE-2021-44225 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-2021-44225 affect?

CVE-2021-44225 affects keepalived, fedora. Severity is medium (CVSS 5.4). In Keepalived through 2.2.4, the D-Bus policy does not sufficiently restrict the message destination, allowing any user to inspect and manipulate any property. This leads to access-control bypass in some situations in which an unrelated D-B

How urgent is CVE-2021-44225?

Priority 35/100. No elevated risk signals yet.

References

← Back to latest CVEs