CVE-2021-23450Public exploitNetwork attack vector

Prototype pollution via unsafe setObject path

Published Dec 17, 2021 · Updated Sep 16, 2024

Prototype Pollution in OpenJS Foundation Dojo Toolkit before 1.17.0 allows remote attackers to alter JavaScript object prototypes via crafted input. The setObject function resolves attacker-controlled property paths without blocking prototype-linked keys, allowing writes into shared prototypes. When an application passes untrusted paths to this function, polluted properties propagate to other objects and can enable arbitrary code execution or service interruption.

CVSS severity9.8
Critical
EPSS probability30.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype Pollution in OpenJS Foundation Dojo Toolkit before 1.17.0 allows remote attackers to alter JavaScript object prototypes via crafted input. The setObject function resolves attacker-controlled property paths without blocking prototype-linked keys, allowing writes into shared prototypes. When an application passes untrusted paths to this function, polluted properties propagate to other objects and can enable arbitrary code execution or service interruption.

The record

CVE
CVE-2021-23450
Published
Dec 17, 2021
Updated
Sep 16, 2024
Vendor
OpenJS Foundation
Product
Dojo Toolkit
Classifications
CWE-1321, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenJS Foundation · Dojo Toolkitversion=0 <unspecified

Published CVSS scores

9.8GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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