How severe is CVE-2019-25004?

CVE-2019-25004 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-2019-25004 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-25004?

CVE-2019-25004 affects Google Flatbuffers. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-25004?

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-2019-25004 published?

CVE-2019-25004 was published on 2020-12-31 and last updated on 2026-06-17.

CVE-2019-25004

CVE-2019-25004 is a critical-severity vulnerability in Google Flatbuffers 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.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Google Flatbuffers
Published: 2020-12-31
Last modified: 2026-06-17

Description

An issue was discovered in the flatbuffers crate before 0.6.1 for Rust. Arbitrary bytes can be reinterpreted as a bool, defeating soundness.

Frequently asked questions

What is CVE-2019-25004?: An issue was discovered in the flatbuffers crate before 0.6.1 for Rust. Arbitrary bytes can be reinterpreted as a bool, defeating soundness.
How severe is CVE-2019-25004?: CVE-2019-25004 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-2019-25004 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-25004?: CVE-2019-25004 affects Google Flatbuffers. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-25004?: 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-2019-25004 published?: CVE-2019-25004 was published on 2020-12-31 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2019-0028.html

Affected products (1)

cpe:2.3:a:google:flatbuffers:*:*:*:*:*:rust:*:*

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