Security readout for executives and security teams
Plain-English summary
This issue affects older versions of the Rust ckb crate used around Nervos CKB block template generation. In some cases, the RPC may fail to prefer a transaction with a higher fee rate. The available sources do not show data theft, remote code execution, or active exploitation.
Executive priority
Treat this as a targeted dependency issue. Prioritize remediation if your organization operates Nervos CKB tooling or depends on the ckb crate. Otherwise, immediate enterprise risk appears limited from the available evidence.
Technical view
CVE-2021-45698 describes incorrect transaction selection behavior in the ckb crate before 0.40.0. The get_block_template RPC may fail when it should select a higher-fee-rate transaction over another. No CVSS score, CWE, exploit details, or operational workaround is provided in the source bundle.
Likely exposure
Exposure is likely limited to systems or applications using the Rust ckb crate before version 0.40.0, especially software relying on get_block_template behavior. General enterprise systems are unlikely to be affected unless they embed or operate this specific blockchain software component.
Exploitation context
The source bundle does not indicate known exploitation, and the CVE is not listed as KEV. The described impact is logic correctness in transaction selection, not a proven compromise path. Business relevance depends on whether the organization operates affected Nervos CKB-related infrastructure.
Researcher notes
Evidence is sparse: no CVSS, CWE, patch notes, exploit status, or detailed impact analysis are included in the bundle. Analysis should stay focused on dependency presence, affected version confirmation, and get_block_template behavior rather than broader assumptions.
Mitigation direction
- Inventory Rust projects and services for the ckb crate.
- Upgrade affected ckb crate usage to version 0.40.0 or later.
- Review RustSec advisory details before deploying updates.
- Check upstream Nervos CKB guidance for any operational recommendations.
Validation and detection
- Check dependency manifests and lockfiles for ckb versions before 0.40.0.
- Confirm deployed artifacts are rebuilt with the updated dependency.
- Review services exposing or using get_block_template RPC behavior.
- Document whether Nervos CKB infrastructure exists in the environment.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-45698 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-2021-0107.htmlCVE reference · x_refsource_MISC
- https://raw.githubusercontent.com/rustsec/advisory-db/main/crates/ckb/RUSTSEC-2021-0107.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.