Security readout for executives and security teams
Plain-English summary
CVE-2021-23373 affects the JavaScript package set-deep-prop. The public record says all versions are vulnerable to prototype pollution through the package’s main functionality. For business leaders, the concern is service reliability: the CVSS record rates availability impact as high, with no authentication or user interaction required.
Executive priority
Treat as a high-priority dependency risk for systems using set-deep-prop, especially internet-facing services. There is no supplied evidence of active exploitation, but the no-authentication CVSS profile and high availability impact justify prompt inventory and remediation planning.
Technical view
The issue is a prototype pollution vulnerability in set-deep-prop. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, scored 7.5. Sources do not provide detailed affected application conditions, exploit procedures, or a confirmed patched version in the supplied bundle.
Likely exposure
Exposure is most likely in Node.js or JavaScript applications that directly or transitively include set-deep-prop. The supplied affected data states all versions are vulnerable, so dependency manifests, lockfiles, and SBOMs should be checked.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates remote, low-complexity conditions without privileges or user interaction, but real-world exploitability depends on how applications pass data into the package.
Researcher notes
Evidence is limited to CVE and Snyk references in the supplied bundle. The affected range is described as all versions, but no patch status, proof-of-concept status, or maintainer advisory details are included here. Validate findings against live dependency data before escalation.
Mitigation direction
- Check Snyk and package maintainer guidance for fixed or replacement options.
- Remove or replace set-deep-prop where practical.
- Avoid passing untrusted keys into deep property assignment paths.
- Update dependency manifests and lockfiles after choosing a safe remediation.
- Run regression tests before release because behavior may affect object handling.
Validation and detection
- Search package manifests and lockfiles for set-deep-prop.
- Check SBOM and package audit output for direct and transitive usage.
- Identify application paths that call set-deep-prop with external input.
- Confirm remediation removed or replaced the vulnerable package version.
- Run unit and integration tests around object mutation behavior.
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-2021-23373 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P
Source materials
- CVE List V5 sourceCVE List V5
- https://security.snyk.io/vuln/SNYK-JS-SETDEEPPROP-1083231CVE 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.