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No exploitation reportedFix available

CVE-2021-38191

No exploitation reported by the sources we read.

  • Published2021-08-08
  • Fixed in1.8.1 · 1.7.2 · 1.6.3 · 1.5.1
  • WeaknessCWE-362

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2021-08-0806:15CVE publishedNVD

Versions per branch

OSV · NVD
Tokio
BranchAffectedFixed in
1.8≥ 1.8.0, < 1.8.11.8.1
1.7≥ 1.7.0, < 1.7.21.7.2
1.6≥ 1.6.0, < 1.6.31.6.3
1.5≥ 0.3.0, < 1.5.11.5.1
1.8= 1.8.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Tokio to 1.8.1 · 1.7.2 · 1.6.3 · 1.5.1

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.15.9read 2026-10-23
  • NVDCVSS 2.04.3read 2026-10-23
  • NVDweakness (CWE)CWE-362read 2026-10-23
  • FIRST EPSSEPSS score0.8 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2021-08-18

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2021-08-08
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-2grh-hm3w-w7hv

Frequently asked questions

What is CVE-2021-38191?

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.

Is CVE-2021-38191 actively exploited?

Active exploitation of CVE-2021-38191 has not been confirmed. Its EPSS score was 0.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-38191?

CVE-2021-38191 has a CVSS v3 base score of 5.9 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.

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