How severe is CVE-2019-16143?

CVE-2019-16143 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-2019-16143 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-16143?

CVE-2019-16143 affects Blake2 Blake2-rust. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-16143?

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-2019-16143 published?

CVE-2019-16143 was published on 2019-09-09 and last updated on 2026-06-17.

CVE-2019-16143

CVE-2019-16143 is a critical-severity vulnerability in Blake2 Blake2-rust 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-327.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Blake2 Blake2-rust
Published: 2019-09-09
Last modified: 2026-06-17

Description

An issue was discovered in the blake2 crate before 0.8.1 for Rust. The BLAKE2b and BLAKE2s algorithms, when used with HMAC, produce incorrect results because the block sizes are half of the required sizes.

Frequently asked questions

What is CVE-2019-16143?: An issue was discovered in the blake2 crate before 0.8.1 for Rust. The BLAKE2b and BLAKE2s algorithms, when used with HMAC, produce incorrect results because the block sizes are half of the required sizes.
How severe is CVE-2019-16143?: CVE-2019-16143 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-2019-16143 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-16143?: CVE-2019-16143 affects Blake2 Blake2-rust. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-16143?: 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-2019-16143 published?: CVE-2019-16143 was published on 2019-09-09 and last updated on 2026-06-17.

References

https://rustsec.org/advisories/RUSTSEC-2019-0019.html

Affected products (1)

cpe:2.3:a:blake2:blake2-rust:*:*:*:*:*:*:*:*

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