Security readout for executives and security teams
Plain-English summary
CVE-2020-36435 is a Rust dependency issue in ruspiro-singleton before 0.4.1. The crate allowed singleton values to be treated as thread-safe without verifying the underlying type was safe to share or send across threads. Business risk depends on whether affected versions are present in shipped Rust software.
Executive priority
Treat this as a dependency hygiene issue unless the affected crate is present in production Rust software. Prioritize confirmation of exposure first, then update affected builds during normal security maintenance.
Technical view
ruspiro-singleton's Singleton type implemented Send and Sync without proper bounds checks. In Rust, those traits govern cross-thread transfer and shared access. For non-thread-safe inner types, this unsoundness can permit unsafe concurrent use and undefined behavior. The source bundle names versions before 0.4.1 as affected.
Likely exposure
Exposure is limited to Rust projects that depend directly or transitively on ruspiro-singleton before 0.4.1. The bundle does not identify operating systems, services, vendors, or public deployments using the affected crate.
Exploitation context
The source bundle does not show active exploitation, public exploit use, or CISA KEV listing. Abuse would require an application context where affected Singleton values are used across threads with types that should not be Send or Sync.
Researcher notes
The issue is Rust type-system unsoundness, not a standalone network vulnerability. Impact depends heavily on how applications instantiate and share Singleton values. No CVSS, CWE, affected CPEs, or exploit evidence were provided in the source bundle.
Mitigation direction
- Upgrade ruspiro-singleton to 0.4.1 or later where feasible.
- Review vendor or RustSec guidance before shipping affected builds.
- Regenerate dependency lockfiles after updating the crate.
- Rebuild and retest products that include the affected dependency.
Validation and detection
- Check Cargo.toml and Cargo.lock for ruspiro-singleton versions below 0.4.1.
- Inspect dependency trees for transitive inclusion of ruspiro-singleton.
- Identify concurrent code paths using Singleton with non-thread-safe inner types.
- Confirm updated builds no longer resolve affected crate versions.
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-2020-36435 mapping review
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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-2020-0115.htmlCVE reference · x_refsource_MISC
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/ruspiro-singleton/RUSTSEC-2020-0115.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.