CVE-2021-25949Public exploitNetwork attack vector

Prototype pollution via unfiltered property paths

Published Jun 10, 2021 · Updated Aug 3, 2024

Prototype pollution in Brian Woodward set-getter 0.1.0 allows remote attackers to corrupt objects via crafted property paths. The define function traverses dot-separated keys and defines a getter without rejecting proto, constructor, or prototype segments, permitting writes through the shared object prototype. Exploitation requires a consuming application to pass attacker-controlled paths; polluted properties can crash the process, while code execution depends on an exploitable downstream use.

CVSS severity9.8
Critical
EPSS probability3.30%
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 Brian Woodward set-getter 0.1.0 allows remote attackers to corrupt objects via crafted property paths. The define function traverses dot-separated keys and defines a getter without rejecting proto, constructor, or prototype segments, permitting writes through the shared object prototype. Exploitation requires a consuming application to pass attacker-controlled paths; polluted properties can crash the process, while code execution depends on an exploitable downstream use.

The record

CVE
CVE-2021-25949
Published
Jun 10, 2021
Updated
Aug 3, 2024
Vendor
Brian Woodward
Product
set-getter
Classifications
CWE-915, CWE-1321, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 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=0.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Brian Woodward · set-getterversion=0.1.0

Published CVSS scores

7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NVDCVSS: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-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
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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