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CVE-2019-16141

23
FAUCET Score

CVE-2019-16141 describes a denial-of-service vulnerability in the once_cell Rust crate, specifically versions prior to 1.0.1, where a panic occurs during the initialization of Lazy. This high-severity vulnerability (CVSS 7.5) is remotely exploitable with low attack complexity, potentially leading to a complete loss of availability for affected systems. There is currently no evidence of active exploitation, and no public exploit code or significant community discussion has been identified.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.2.6, < 1.0.1CPE matchmatch criteria
cpe:2.3:a:once_cell_project:once_cell:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.58%
Probability of exploitation in next 30 days
EPSS Percentile
73.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0158 is in the 55th percentile among its peer group of 51,466 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: once_cellFixed in: 1.0.1

Vendor Advisories (1)

rustGHSA-7j44-fv4x-79g9high

Improper Input Validation in once_cell

Aug 25, 2021

References

github.com / matklad/once_cell/issues/46
Third Party Advisory
rustsec.org / advisories/RUSTSEC-2019-0017.html
Third Party Advisory