Security readout for executives and security teams
Plain-English summary
CVE-2020-36439 affects the Rust ticketed_lock crate before 0.3.0. The issue is a thread-safety flaw: ticket objects were marked as safe to send between threads without checking the data type they protected. This can undermine Rust’s usual safety guarantees in applications that used the affected crate.
Executive priority
Treat this as a targeted dependency hygiene issue, not a broad emergency. Prioritize systems using Rust concurrency and the affected crate, then update and validate dependency versions through normal release controls.
Technical view
ReadTicket<T> and WriteTicket<T> had unconditional Send implementations before ticketed_lock 0.3.0. That means ticket values could be transferred across threads even when T was not safe to transfer, creating an unsound API boundary. The provided sources do not include CVSS, CWE, exploit details, or broader product impact.
Likely exposure
Exposure is likely limited to Rust projects that directly or transitively used ticketed_lock versions before 0.3.0. The provided affected-product metadata is sparse, so dependency inventory is required to confirm real exposure.
Exploitation context
The source bundle does not show active exploitation, public exploit activity, or KEV listing. Practical impact depends on whether application code used affected ticket types across threads with data that should not be Send.
Researcher notes
The core issue is Rust unsoundness from unconditional Send implementations on generic ticket types. The public bundle does not provide CVSS, CWE mapping, PoC status, or detailed exploitability evidence, so analysis should stay dependency- and code-path-specific.
Mitigation direction
- Upgrade ticketed_lock to version 0.3.0 or later.
- Check vendor and RustSec guidance before choosing any workaround.
- Regenerate dependency locks after updating the crate.
- Prioritize applications using ticketed_lock in concurrent or threaded code paths.
Validation and detection
- Search Rust dependency manifests and lockfiles for ticketed_lock.
- Confirm no deployed build uses ticketed_lock before 0.3.0.
- Review transitive dependencies with Rust dependency tooling.
- Inspect concurrent code paths using ReadTicket<T> or WriteTicket<T>.
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-2020-36439 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-2020-0119.htmlCVE reference · x_refsource_MISC
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/ticketed_lock/RUSTSEC-2020-0119.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.