CVE-2020-28449Public exploitNetwork attack vector

Object prototype modification via unchecked property paths

Published Feb 4, 2021 · Updated Sep 16, 2024

Prototype pollution in decal 2.1.3 and earlier allows remote attackers to modify Object.prototype through a crafted path passed to set(). The set function resolves dot-delimited paths with getObjKeyPair, traverses inherited properties without rejecting proto, and assigns the final segment. Exploitation requires a consuming application to pass attacker-controlled paths; the resulting inherited-property corruption can alter application logic or interrupt service, depending on available gadgets.

CVSS severity8.6
High
EPSS probability1.76%
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 decal 2.1.3 and earlier allows remote attackers to modify Object.prototype through a crafted path passed to set(). The set function resolves dot-delimited paths with getObjKeyPair, traverses inherited properties without rejecting proto, and assigns the final segment. Exploitation requires a consuming application to pass attacker-controlled paths; the resulting inherited-property corruption can alter application logic or interrupt service, depending on available gadgets.

The record

CVE
CVE-2020-28449
Published
Feb 4, 2021
Updated
Sep 16, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-400, CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.6SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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 exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

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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