How severe is CVE-2022-36437?

CVE-2022-36437 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2022-36437 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-36437?

CVE-2022-36437 primarily affects Hazelcast. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-36437?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2022-36437 published?

CVE-2022-36437 was published on 2022-12-29 and last updated on 2026-06-17.

CVE-2022-36437

CVE-2022-36437 is a critical-severity vulnerability in Hazelcast with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-384.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-384
Affected product: Hazelcast
Published: 2022-12-29
Last modified: 2026-06-17

Description

The Connection handler in Hazelcast and Hazelcast Jet allows a remote unauthenticated attacker to access and manipulate data in the cluster with the identity of another already authenticated connection. The affected Hazelcast versions are through 4.0.6, 4.1.9, 4.2.5, 5.0.3, and 5.1.2. The affected Hazelcast Jet versions are through 4.5.3.

Frequently asked questions

What is CVE-2022-36437?: The Connection handler in Hazelcast and Hazelcast Jet allows a remote unauthenticated attacker to access and manipulate data in the cluster with the identity of another already authenticated connection. The affected Hazelcast versions are through 4.0.6, 4.1.9, 4.2.5, 5.0.3, and 5.1.2. The affected Hazelcast Jet versions are through 4.5.3.
How severe is CVE-2022-36437?: CVE-2022-36437 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2022-36437 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-36437?: CVE-2022-36437 primarily affects Hazelcast. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-36437?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2022-36437 published?: CVE-2022-36437 was published on 2022-12-29 and last updated on 2026-06-17.

References

https://github.com/hazelcast/hazelcast/security/advisories/GHSA-c5hg-mr8r-f6jp

Affected products (4)

cpe:2.3:a:hazelcast:hazelcast:*:*:*:*:-:*:*:*
cpe:2.3:a:hazelcast:hazelcast:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:hazelcast:hazelcast-jet:*:*:*:*:-:*:*:*
cpe:2.3:a:hazelcast:hazelcast-jet:*:*:*:*:enterprise:*:*:*

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