CVE-2021-24105Known exploitationPublic exploit

Code execution via public-package precedence

Published Feb 25, 2021 · Updated Aug 3, 2024

Package Manager Configurations allow attackers to execute code when public repositories supply a higher-versioned private dependency. A resolver configured to consult private and public repositories selects the attacker's higher-versioned namesake and runs its install code during retrieval. Exposure requires an unclaimed public package name matching a private dependency and a workflow that does not pin or isolate its source.

CVSS severity8.4
High
EPSS probability2.38%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Package Manager Configurations allow attackers to execute code when public repositories supply a higher-versioned private dependency. A resolver configured to consult private and public repositories selects the attacker's higher-versioned namesake and runs its install code during retrieval. Exposure requires an unclaimed public package name matching a private dependency and a workflow that does not pin or isolate its source.

The record

CVE
CVE-2021-24105
Published
Feb 25, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1195.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8NISTAV:N/AC:M/Au:N/C:P/I:P/A:P
8.4Microsoft CorporationCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8NISTCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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)
Vectorlocal
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

T1195.001Compromise Software Dependencies and Development Tools

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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