How severe is CVE-2020-35864?

CVE-2020-35864 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-35864 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-35864?

CVE-2020-35864 affects Google Flatbuffers. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-35864?

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

When was CVE-2020-35864 published?

CVE-2020-35864 was published on 2020-12-31 and last updated on 2026-06-17.

CVE-2020-35864

CVE-2020-35864 is a high-severity vulnerability in Google Flatbuffers with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (44th 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 through 2020-04-11 for Rust. read_scalar (and read_scalar_at) can transmute values without unsafe blocks.

Frequently asked questions

What is CVE-2020-35864?: An issue was discovered in the flatbuffers crate through 2020-04-11 for Rust. read_scalar (and read_scalar_at) can transmute values without unsafe blocks.
How severe is CVE-2020-35864?: CVE-2020-35864 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-35864 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-35864?: CVE-2020-35864 affects Google Flatbuffers. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-35864?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-35864 published?: CVE-2020-35864 was published on 2020-12-31 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2020-0009.html

Affected products (1)

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

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