How severe is CVE-2018-6331?

CVE-2018-6331 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-2018-6331 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-6331?

CVE-2018-6331 affects Facebook Buck. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-6331?

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-2018-6331 published?

CVE-2018-6331 was published on 2018-12-31 and last updated on 2026-06-17.

CVE-2018-6331

CVE-2018-6331 is a critical-severity vulnerability in Facebook Buck 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: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Facebook Buck
Published: 2018-12-31
Last modified: 2026-06-17

Description

Buck parser-cache command loads/saves state using Java serialized object. If the state information is maliciously crafted, deserializing it could lead to code execution. This issue affects Buck versions prior to v2018.06.25.01.

Frequently asked questions

What is CVE-2018-6331?: Buck parser-cache command loads/saves state using Java serialized object. If the state information is maliciously crafted, deserializing it could lead to code execution. This issue affects Buck versions prior to v2018.06.25.01.
How severe is CVE-2018-6331?: CVE-2018-6331 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-2018-6331 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-6331?: CVE-2018-6331 affects Facebook Buck. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-6331?: 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-2018-6331 published?: CVE-2018-6331 was published on 2018-12-31 and last updated on 2026-06-17.

References

https://github.com/facebook/buck/commit/8c5500981812564877bd122c0f8fab48d3528ddf

Affected products (1)

cpe:2.3:a:facebook:buck:*:*:*:*:*:*:*:*

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