CVE-2023-45859: In Hazelcast through 4.1.10, 4.2 through 4.2.8, 5.0 through 5.0.5, 5.1 through 5.1.7, 5.2 through 5.2.4, and 5

Routine

HIGH 7.6UPGRADE

CVE-2023-45859 is a high-severity flaw (CVSS 7.6) affecting hazelcast. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Hazelcast through 4.1.10, 4.2 through 4.2.8, 5.0 through 5.0.5, 5.1 through 5.1.7, 5.2 through 5.2.4, and 5.3 through 5.3.2, some client operations don't check permissions properly, allowing authenticated users to access data stored in the cluster.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-922
Published	2024-02-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hazelcast

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

Am I affected?

Timeline

2024-02-28 22:15 UTCPublished CVE record published
2026-06-17 06:29 UTCUpdated Record last modified

hazelcast hazelcast UPGRADE

Affected: <= 4.1.10 · >= 4.2.0 and <= 4.2.8 · >= 5.0.0 and <= 5.0.5 · >= 5.1.0 and <= 5.1.7 · >= 5.2.0 and < 5.2.5 · >= 5.3.0 and < 5.3.5

Fixed in: 5.2.5, 5.3.5

Safe to downgrade to: a release before 4.2.0

1. Check installed version

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

2. UPGRADE to 5.2.5 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hazelcast

Note

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

3. If no update is available yet, DOWNGRADE to a release before 4.2.0 (Debian / Ubuntu)

apt-cache madison hazelcast sudo apt install hazelcast=<VERSION_BEFORE_4.2.0> sudo apt-mark hold hazelcast

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list hazelcast sudo dnf downgrade hazelcast-<VERSION_BEFORE_4.2.0> sudo dnf versionlock add hazelcast

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-45859?

hazelcast: upgrade to 5.2.5, 5.3.5. Exact commands for each OS are on this page.

Is CVE-2023-45859 being exploited?

CVE-2023-45859 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-2023-45859 affect?

CVE-2023-45859 affects hazelcast. Severity is high (CVSS 7.6). In Hazelcast through 4.1.10, 4.2 through 4.2.8, 5.0 through 5.0.5, 5.1 through 5.1.7, 5.2 through 5.2.4, and 5.3 through 5.3.2, some client operations don't check permissions properly, allowing authenticated users to access data stored in t

How urgent is CVE-2023-45859?

Priority 38/100. High severity

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References

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