Security readout for executives and security teams
Plain-English summary
Tokio is a core Rust async runtime. In versions before 1.8.1, aborting a task can cause it to be dropped on the wrong thread. The provided sources do not describe confirmed business impact, but Rust services using affected Tokio versions should prioritize dependency review and upgrade planning.
Executive priority
Handle as a targeted dependency hygiene item, not an emergency based on current evidence. Prioritize internet-facing or business-critical Rust services if they run affected Tokio versions, because the provided sources do not quantify impact or exploitation likelihood.
Technical view
Tokio before 1.8.1 may drop a Task in the wrong thread after JoinHandle::abort. The source bundle provides no CVSS, CWE, exploitability, or detailed impact. Treat this as a dependency-level correctness and runtime-safety issue where abort paths are reachable.
Likely exposure
Exposure is limited to Rust applications or libraries that depend on the tokio crate before 1.8.1. Risk is most relevant where code uses or can trigger JoinHandle::abort. The bundle lists no CPEs and no affected vendor/product beyond Tokio.
Exploitation context
No source in the bundle reports active exploitation, and KEV is false. The bundle provides no proof-of-concept, attacker prerequisites, or weaponization details. Exploitability and practical impact remain unclear from the supplied evidence.
Researcher notes
The key evidence is narrow: affected Tokio versions before 1.8.1 and incorrect task drop thread behavior after JoinHandle::abort. No CVSS, CWE, CPE, patch details beyond version boundary, exploit status, or impact analysis is included in the supplied bundle.
Mitigation direction
- Upgrade tokio to version 1.8.1 or later.
- Review Cargo.lock for resolved tokio versions below 1.8.1.
- Check vendor or upstream RustSec guidance for any additional remediation notes.
- Prioritize services that call JoinHandle::abort or abort spawned tasks.
Validation and detection
- Inventory Rust projects using the tokio crate.
- Confirm resolved tokio versions in dependency lockfiles.
- Search application code for JoinHandle::abort usage.
- Run existing unit and integration tests after dependency updates.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2021-38191 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://rustsec.org/advisories/RUSTSEC-2021-0072.htmlCVE reference · x_refsource_MISC
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/tokio/RUSTSEC-2021-0072.mdCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.