CVE-2021-32736Network attack vector

Object property corruption via prototype pollution

Published Jun 30, 2021 · Updated Aug 3, 2024

Prototype pollution in ThinkJS think-helper before 1.1.3 allows remote attackers to modify inherited object properties through crafted input. The published advisory identifies uncontrolled object-attribute updates but does not disclose the affected helper function or precise assignment path. Reachability requires a consuming Node.js application to pass attacker-controlled attributes into the affected helper, enabling modification of properties inherited by other objects.

CVSS severity7.5
High
EPSS probability1.01%
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 ThinkJS think-helper before 1.1.3 allows remote attackers to modify inherited object properties through crafted input. The published advisory identifies uncontrolled object-attribute updates but does not disclose the affected helper function or precise assignment path. Reachability requires a consuming Node.js application to pass attacker-controlled attributes into the affected helper, enabling modification of properties inherited by other objects.

The record

CVE
CVE-2021-32736
Published
Jun 30, 2021
Updated
Aug 3, 2024
Vendor
ThinkJS
Product
think-helper
Classifications
CWE-1321, CAPEC-77, CAPEC-180, CAPEC-1
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=< 1.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ThinkJS · think-helperversion=< 1.1.3

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CAPEC-77Manipulating User-Controlled Variables
CAPEC-180Exploiting Incorrectly Configured Access Control Security Levels
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs

Public exploit references

No public exploit references are available in this record.

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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