CVE-2021-25912Public exploitNetwork attack vector

Code execution via unsafe prototype path traversal

Published Feb 2, 2021 · Updated Aug 3, 2024

Prototype pollution in dotty 0.0.1 through 0.1.0 allows remote attackers to crash services or execute code via crafted paths. The put function recursively follows dot-separated path components and writes through the inherited proto property without rejecting it. Applications are exposed when attacker-controlled paths reach put; process-wide prototype changes cause a crash or code execution when a usable downstream gadget exists.

CVSS severity9.8
Critical
EPSS probability3.34%
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 dotty 0.0.1 through 0.1.0 allows remote attackers to crash services or execute code via crafted paths. The put function recursively follows dot-separated path components and writes through the inherited proto property without rejecting it. Applications are exposed when attacker-controlled paths reach put; process-wide prototype changes cause a crash or code execution when a usable downstream gadget exists.

The record

CVE
CVE-2021-25912
Published
Feb 2, 2021
Updated
Aug 3, 2024
Vendor
Deoxxa Development
Product
dotty
Classifications
CWE-1321, CAPEC-1, CAPEC-180, CAPEC-77
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 2, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0.0.1, 0.0.2, 0.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Deoxxa Development · dottyversion=0.0.1, 0.0.2, 0.1.0

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NVDAV: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-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
CAPEC-180Exploiting Incorrectly Configured Access Control Security Levels
CAPEC-77Manipulating User-Controlled Variables

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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