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CVE-2019-16143

29
FAUCET Score

CVE-2019-16143 is a critical vulnerability affecting the blake2 crate for Rust, specifically versions prior to 0.8.1. It causes the BLAKE2b and BLAKE2s algorithms to produce incorrect HMAC results due to improperly sized blocks. With a CVSS score of 9.8, this vulnerability is easily exploitable over the network with low complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this flaw.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.8.1CPE matchmatch criteria
cpe:2.3:a:blake2:blake2-rust:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.93%
Probability of exploitation in next 30 days
EPSS Percentile
57.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0093 is in the 42nd percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: blake2Fixed in: 0.8.1

Vendor Advisories (1)

rustGHSA-4x25-pvhw-5224critical

Algorithms compute incorrect results in blake2

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2019-0019.html
Third Party Advisory