Security readout for executives and security teams
Plain-English summary
This CVE concerns Ramda, a JavaScript utility library. The reported issue says applications using mapObjIndexed on crafted objects may unexpectedly create objects with custom prototypes, affecting integrity or availability. The vendor disputes the vulnerability characterization, and the public record provides no CVSS score or confirmed active exploitation.
Executive priority
Do not treat this as an emergency from the supplied evidence. Prioritize inventory and targeted validation where Ramda handles external input, then follow vendor guidance.
Technical view
CVE-2021-42581 reports prototype poisoning in Ramda 0.27.0 and earlier through mapObjIndexed when given an object with an own __proto__ property. The CVE says this could affect integrity or availability. The note says the vendor disputes it as expected object/prototype behavior rather than a security flaw.
Likely exposure
Exposure is limited to JavaScript applications using Ramda 0.27.0 or earlier and passing attacker-controlled objects into mapObjIndexed or related data flows.
Exploitation context
The source bundle does not show KEV listing, active exploitation, weaponized public exploits, CVSS scoring, or a confirmed patched version. Treat exploitability as unconfirmed and context-dependent.
Researcher notes
Key uncertainty is whether observed behavior crosses a security boundary in real applications. The vendor dispute, missing CVSS, absent KEV status, and lack of named fix reduce confidence in broad severity claims.
Mitigation direction
- Inventory Ramda versions in application dependencies and SBOMs.
- Identify uses of mapObjIndexed that process untrusted object input.
- Reject or normalize dangerous object keys before transformation boundaries.
- Check Ramda vendor guidance and advisories for supported remediation direction.
- Add regression tests for prototype-sensitive object handling.
Validation and detection
- Confirm whether Ramda 0.27.0 or earlier is present.
- Trace mapObjIndexed call sites handling user-controlled objects.
- Review whether transformed objects influence authorization, routing, caching, or persistence.
- Test that crafted prototype keys do not alter trusted object behavior.
- Document the vendor dispute in vulnerability tracking records.
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-2021-42581 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://github.com/ramda/ramda/pull/3192CVE reference · x_refsource_MISC
- https://jsfiddle.net/3pomzw5g/2/CVE 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.