What is CVE-2019-25004?

CVE-2019-25004 is a critical-severity vulnerability in Google Flatbuffers. CVSS score: 9.8/10. Published 2020-12-31.

How severe is CVE-2019-25004?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Google Flatbuffers

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.

Published 2020-12-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (45.9th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Google Flatbuffers

References

rustsec.org/advisories/RUSTSEC-2019-0028.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2019-25004?: CVE-2019-25004 is a critical-severity vulnerability in Google Flatbuffers. CVSS score: 9.8/10. Published 2020-12-31.
How severe is CVE-2019-25004?: Critical severity. CVSS v3 base score is 9.8 out of 10.