LiveActive security incident?Get immediate response
CVE Record

CVE-2021-23444: Prototype Pollution

This affects the package jointjs before 3.4.2. A type confusion vulnerability can lead to a bypass of CVE-2020-28480 when the user-provided keys used in the path parameter are arrays in the setByPath function.

MediumCVSS 5.6Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

JointJS versions before 3.4.2 can mishandle certain user-supplied path keys, allowing a prototype pollution bypass of an earlier fix. Business impact is most relevant where JointJS processes untrusted data. The public record rates this medium severity, with limited confidentiality, integrity, and availability impact.

Executive priority

Prioritize remediation during the next normal dependency update cycle unless JointJS processes untrusted data in exposed workflows. Escalate sooner for internet-facing applications or shared platforms where polluted objects could affect downstream behavior.

Technical view

CVE-2021-23444 is a type confusion issue in JointJS setByPath. Array values used as user-provided path keys can bypass the CVE-2020-28480 protection and lead to prototype pollution. Sources identify JointJS before 3.4.2 as affected, with a fix associated with the 3.4.2 release and linked upstream changes.

Likely exposure

Exposure is likely in applications bundling jointjs before 3.4.2, including Java projects using the referenced WebJars npm or bower packages. Risk is higher if user-controlled input can reach JointJS path-setting behavior.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. The CVSS vector is network reachable, unauthenticated, no user interaction, but high attack complexity and limited impact. Treat exploitability as plausible, not proven active.

Researcher notes

The record is specific to a bypass of CVE-2020-28480 through array path keys in setByPath. Evidence supports affected versions before 3.4.2 and patched upstream changes, but does not provide confirmed exploitation or detailed environmental prerequisites.

Mitigation direction

  • Upgrade jointjs to version 3.4.2 or later.
  • Update referenced WebJars npm or bower JointJS packages if used.
  • Confirm lockfiles resolve to the patched JointJS version.
  • Avoid passing untrusted path arrays into JointJS path-setting behavior.
  • Check upstream vendor release and PR notes for implementation details.

Validation and detection

  • Inventory package-lock, yarn.lock, pnpm-lock, Maven, Gradle, and SBOM data for jointjs.
  • Flag any resolved JointJS version earlier than 3.4.2.
  • Identify code paths using JointJS setByPath with externally influenced path values.
  • Review API or import flows that transform user input into JointJS object paths.
  • Confirm dependency scanners no longer report CVE-2021-23444 after upgrade.
Prepared
Confidence
high
Sources
8

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2021-23444 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.6 (3.1)
Known Exploited
No
Published

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

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
7Source 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
5.6CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C2.23.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.6Medium
CVSS 3.1 vector shape for CVE-2021-23444Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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/ajointjsunspecifiedListed
Weakness

CWE details

No CWE listed

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