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CVE-2021-38191

21
FAUCET Score

CVE-2021-38191 is a medium-severity vulnerability affecting the Tokio Rust crate versions prior to 1.8.1, where a Task may be dropped on an incorrect thread following a JoinHandle::abort. This network-exploitable flaw has high attack complexity but could lead to a denial of service. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.3.0, < 1.5.1CPE matchmatch criteria
cpe:2.3:a:tokio:tokio:*:*:*:*:*:rust:*:*
>= 1.6.0, < 1.6.3CPE matchmatch criteria
cpe:2.3:a:tokio:tokio:*:*:*:*:*:rust:*:*
>= 1.7.0, < 1.7.2CPE matchmatch criteria
cpe:2.3:a:tokio:tokio:*:*:*:*:*:rust:*:*
1.8.0CPE matchmatch criteria
cpe:2.3:a:tokio:tokio:1.8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.84%
Probability of exploitation in next 30 days
EPSS Percentile
54.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0084 is in the 11th percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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 (4)

rustpatch availablevia ghsa
Product: tokioFixed in: 1.8.1
rustpatch availablevia ghsa
Product: tokioFixed in: 1.7.2
rustpatch availablevia ghsa
Product: tokioFixed in: 1.6.3
rustpatch availablevia ghsa
Product: tokioFixed in: 1.5.1

Vendor Advisories (2)

rustGHSA-2grh-hm3w-w7hvmedium

Race condition in tokio

Aug 25, 2021
microsoft2021-Aug/CVE-2021-38191Moderate

An issue was discovered in the tokio crate before 1.8.1 for Rust. Upon a JoinHandle::abort, a Task may be dropped in the wrong thread.

Aug 10, 2021

References

raw.githubusercontent.com / rustsec/advisory-db/main/crates/tokio/RUSTSEC-2021-0072.md
Third Party Advisory
rustsec.org / advisories/RUSTSEC-2021-0072.html
ExploitIssue TrackingPatchThird Party Advisory