Security readout for executives and security teams
Plain-English summary
CVE-2021-38190 affects the Rust nalgebra crate before 0.27.1. The library could permit out-of-bounds memory access when matrix element counts did not match row and column dimensions. Business urgency depends on whether products ship affected nalgebra versions and process attacker-influenced matrix inputs.
Executive priority
Treat this as a dependency hygiene issue with potential memory-safety impact. Prioritize confirmation and upgrade in affected Rust services, but do not assume internet-scale exploitation from the provided evidence.
Technical view
The issue is an out-of-bounds memory access condition in nalgebra before 0.27.1. The cited description says nalgebra failed to ensure element count equaled rows multiplied by columns, creating unsafe memory access risk. No CVSS, CWE, or detailed affected CPEs are provided in the bundle.
Likely exposure
Exposure is likely limited to Rust applications or services that directly or transitively depend on nalgebra versions before 0.27.1. Risk is higher where matrix dimensions or backing data can be influenced by untrusted input.
Exploitation context
The source bundle does not cite active exploitation, and KEV is false. Public details establish the bug class and version boundary, but not real-world abuse, exploit maturity, or application-level impact.
Researcher notes
Key uncertainty is application reachability. The advisory identifies nalgebra before 0.27.1 and an element-count validation flaw, but the bundle does not provide CVSS, CWE, exploit status, or detailed vulnerable APIs.
Mitigation direction
- Inventory Rust projects for nalgebra dependencies before 0.27.1.
- Upgrade nalgebra to 0.27.1 or later where compatible.
- Check RustSec advisory guidance before choosing compensating controls.
- Review code paths using attacker-influenced matrix dimensions or data.
- Prioritize rebuilds for services handling untrusted scientific or numeric input.
Validation and detection
- Run dependency auditing against Cargo.lock files for RUSTSEC-2021-0070.
- Confirm nalgebra resolved versions are 0.27.1 or later.
- Review transitive dependencies that may pin older nalgebra releases.
- Test affected workflows after dependency updates.
- Document any temporary exceptions and their exposed input paths.
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
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ATT&CK lookup starting points
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CVE-2021-38190 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-2021-0070.htmlCVE reference · x_refsource_MISC
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/nalgebra/RUSTSEC-2021-0070.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.