How severe is CVE-2018-21234?

CVE-2018-21234 has a CVSS 3.x base score of 9.8, 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 high.

Is CVE-2018-21234 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-21234?

CVE-2018-21234 primarily affects Jodd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-21234?

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-2018-21234 published?

CVE-2018-21234 was published on 2020-05-21 and last updated on 2026-06-17.

CVE-2018-21234

CVE-2018-21234 is a critical-severity vulnerability in Jodd with a CVSS 3.x base score of 9.8. 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Jodd
Published: 2020-05-21
Last modified: 2026-06-17

Description

Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.

Frequently asked questions

What is CVE-2018-21234?: Jodd before 5.0.4 performs Deserialization of Untrusted JSON Data when setClassMetadataName is set.
How severe is CVE-2018-21234?: CVE-2018-21234 has a CVSS 3.x base score of 9.8, 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 high.
Is CVE-2018-21234 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-21234?: CVE-2018-21234 primarily affects Jodd. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-21234?: 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-2018-21234 published?: CVE-2018-21234 was published on 2020-05-21 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:jodd:jodd:*:*:*:*:*:*:*:*
cpe:2.3:a:apache:hive:3.1.2:*:*:*:*:*:*:*

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