How severe is CVE-2021-31919?

CVE-2021-31919 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 high, integrity none, and availability none.

Is CVE-2021-31919 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31919?

CVE-2021-31919 affects Rkyv Project Rkyv. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-31919?

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-2021-31919 published?

CVE-2021-31919 was published on 2021-04-30 and last updated on 2026-06-17.

CVE-2021-31919

CVE-2021-31919 is a high-severity vulnerability in Rkyv Project Rkyv 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. The underlying weakness is classified as CWE-909.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-909
Affected product: Rkyv Project Rkyv
Published: 2021-04-30
Last modified: 2026-06-17

Description

An issue was discovered in the rkyv crate before 0.6.0 for Rust. When an archive is created via serialization, the archive content may contain uninitialized values of certain parts of a struct.

Frequently asked questions

What is CVE-2021-31919?: An issue was discovered in the rkyv crate before 0.6.0 for Rust. When an archive is created via serialization, the archive content may contain uninitialized values of certain parts of a struct.
How severe is CVE-2021-31919?: CVE-2021-31919 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 high, integrity none, and availability none.
Is CVE-2021-31919 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31919?: CVE-2021-31919 affects Rkyv Project Rkyv. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-31919?: 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-2021-31919 published?: CVE-2021-31919 was published on 2021-04-30 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2021-0054.html

Affected products (1)

cpe:2.3:a:rkyv_project:rkyv:*:*:*:*:*:rust:*:*

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