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CVE Record

CVE-2021-23702: Prototype Pollution

The package object-extend from 0.0.0 are vulnerable to Prototype Pollution via object-extend.

HighCVSS 7.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-23702 is a high-severity prototype pollution issue in the npm package object-extend version 0.0.0. If an application uses that package with attacker-influenced object data, object behavior may be altered, mainly threatening integrity. The provided sources do not show active exploitation or a named fixed version.

Executive priority

Prioritize remediation where object-extend 0.0.0 is present in production services handling user-controlled input. The severity is high because integrity impact is rated high, but urgency should be calibrated by confirmed dependency presence and exposed data flows.

Technical view

The CVE describes prototype pollution via object-extend, affecting version 0.0.0. CVSS 3.1 is 7.6: AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L/E:P. This indicates network access, low complexity, low privileges, no user interaction, unchanged scope, high integrity impact, and limited confidentiality and availability impact.

Likely exposure

Exposure is likely limited to JavaScript or Node.js projects that directly or transitively include object-extend 0.0.0. Practical risk depends on whether untrusted input reaches object extension or merge logic. The bundle does not identify other affected products, CPEs, or platforms.

Exploitation context

The CVE has KEV set to false, and the provided sources do not cite active exploitation. Exploitability is rated proof-of-concept in the CVSS environmental data. Treat this as a dependency-risk issue requiring inventory confirmation rather than assuming internet-wide exploitation.

Researcher notes

The available evidence is narrow: one affected package version, CVSS data, and a Snyk reference. No CWE, CPE, patch version, or exploitation evidence is included in the bundle. Validate dependency reachability before escalating beyond standard high-severity dependency handling.

Mitigation direction

  • Inventory applications for object-extend version 0.0.0.
  • Check Snyk and upstream package guidance for a safe remediation path.
  • Remove the dependency if it is unused or replace it with maintained code.
  • Prioritize services processing untrusted JSON or request bodies.
  • Retest affected applications after dependency changes.

Validation and detection

  • Search dependency lockfiles and SBOMs for object-extend 0.0.0.
  • Confirm whether the package is direct or transitive.
  • Map call paths where untrusted input reaches object extension logic.
  • Review dependency scanner results against CVE-2021-23702.
  • Verify remediation through updated SBOM or lockfile evidence.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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-2021-23702 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L/E:P

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.6CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L/E:P2.84.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.6High
CVSS 3.1 vector shape for CVE-2021-23702Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L/E:P

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aobject-extend0.0.0Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.