Security readout for executives and security teams
Plain-English summary
CVE-2020-36438 affects Rust software that uses the tiny_future crate before version 0.4.0. The issue is in Rust trait bounds: a future object can be treated as thread-safe without proving its contained type is thread-safe. Business urgency depends on whether this crate is present in production builds.
Executive priority
Prioritize as a targeted dependency remediation item. It is not supported as actively exploited by the provided sources, but affected production Rust services should upgrade during normal security maintenance.
Technical view
tiny_future Future<T> lacks proper bounds on Send and Sync before 0.4.0. That can undermine Rust's normal thread-safety guarantees when values are moved or shared across threads. The provided sources do not include CVSS, CWE, exploit details, or application-level impact examples.
Likely exposure
Exposure is limited to Rust projects that directly or transitively depend on tiny_future versions earlier than 0.4.0. Systems not using this crate are not affected based on the provided evidence.
Exploitation context
The source bundle does not show CISA KEV listing, active exploitation, public exploit evidence, or attack prerequisites. Treat this as a dependency correctness and memory-safety risk requiring inventory-based triage, not emergency incident response.
Researcher notes
The advisory evidence is sparse: no CVSS, CWE, exploit status, or affected CPEs are provided. The key technical fact is missing Send/Sync bounds on Future<T> before 0.4.0, creating potential Rust soundness concerns.
Mitigation direction
- Upgrade tiny_future to version 0.4.0 or later where feasible.
- Check RustSec guidance before choosing compensating controls.
- Remove unused dependencies that pull tiny_future into production builds.
- Prioritize externally exposed or multithreaded Rust services using the crate.
Validation and detection
- Review Cargo.lock for tiny_future and record any version below 0.4.0.
- Check direct and transitive dependency paths that introduce tiny_future.
- Confirm production build artifacts actually include the affected dependency.
- Document affected services and owners for upgrade tracking.
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-2020-36438 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-2020-0118.htmlCVE reference · x_refsource_MISC
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/tiny_future/RUSTSEC-2020-0118.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.