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CVE-2021-25901

19
FAUCET Score

CVE-2021-25901 describes a data race vulnerability in the lazy-init Rust crate, specifically affecting versions through 2021-01-17, due to a missing Send bound. This medium-severity issue (CVSS 5.3) can be exploited remotely with low attack complexity, potentially leading to a denial of service (availability impact). There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 0.4.0CPE matchmatch criteria
cpe:2.3:a:lazy-init_project:lazy-init:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.31%
Probability of exploitation in next 30 days
EPSS Percentile
67.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0131 is in the 48th percentile among its peer group of 23,701 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

rustpatch availablevia ghsa
Product: lazy-initFixed in: 0.4.0

Vendor Advisories (1)

rustGHSA-w47j-hqpf-qw9wmedium

Out of bounds read in lazy-init

Aug 25, 2021

References

rustsec.org / advisories/RUSTSEC-2021-0004.html
PatchThird Party Advisory