CVE-2021-27081

Code execution via untrusted workspace ESLint library

Published Mar 11, 2021 · Updated Aug 19, 2026

Remote code execution in Microsoft Visual Studio Code ESLint extension before 2.1.10 allows attackers to run code via a crafted workspace. The extension loads and executes a workspace-local ESLint library without prior approval when validating files. A user must open the attacker-controlled workspace and trigger ESLint validation; execution occurs with that user's privileges.

CVSS severity7.8
High
EPSS probability4.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Microsoft Visual Studio Code ESLint extension before 2.1.10 allows attackers to run code via a crafted workspace. The extension loads and executes a workspace-local ESLint library without prior approval when validating files. A user must open the attacker-controlled workspace and trigger ESLint validation; execution occurs with that user's privileges.

The record

CVE
CVE-2021-27081
Published
Mar 11, 2021
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Visual Studio Code ESLint extension
Classifications
T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0 <publication

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Microsoft · Visual Studio Code ESLint extensionversion=0 <publication

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
9.3NVDAV:N/AC:M/Au:N/C:C/I:C/A:C
7.8Microsoft CorporationCVSS: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.

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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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1203Exploitation for Client Execution
T1204.002User Execution: Malicious File

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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