CVE-2021-25928Network attack vector

Code execution via unchecked prototype-path expansion

Published Apr 26, 2021 · Updated Apr 30, 2025

Prototype pollution in safe-obj 1.0.0 through 1.0.2 allows remote attackers to cause denial of service or execute code via a crafted path. The expand function splits the path on dots, follows inherited properties with the in operator, and recursively assigns the supplied value without rejecting proto, constructor, or prototype segments. Exploitation requires a consuming application to pass attacker-controlled path and value data to expand; code execution additionally depends on a usable downstream gadget.

CVSS severity9.8
Critical
EPSS probability3.39%
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 safe-obj 1.0.0 through 1.0.2 allows remote attackers to cause denial of service or execute code via a crafted path. The expand function splits the path on dots, follows inherited properties with the in operator, and recursively assigns the supplied value without rejecting proto, constructor, or prototype segments. Exploitation requires a consuming application to pass attacker-controlled path and value data to expand; code execution additionally depends on a usable downstream gadget.

The record

CVE
CVE-2021-25928
Published
Apr 26, 2021
Updated
Apr 30, 2025
Vendor
Manta Media
Product
safe-obj
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2025Record 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=1.0.0, 1.0.1, 1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Manta Media · safe-objversion=1.0.0, 1.0.1, 1.0.2

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8CISA-ADPCVSS: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.

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')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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