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CVE

CVE-2021-39184

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. A vulnerability

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. A vulnerability in versions prior to 11.5.0, 12.1.0, and 13.3.0 allows a sandboxed renderer to request a "thumbnail" image of an arbitrary file on the user's system. The thumbnail can potentially include significant parts of the original file, including textual data in many cases.

Versions 15.0.0-alpha.10, 14.0.0, 13.3.0, 12.1.0, and 11.5.0 all contain a fix for the vulnerability. Two workarounds aside from upgrading are available. One may make the vulnerability significantly more difficult for an attacker to exploit by enabling contextIsolation in one's app.

One may also disable the functionality of the createThumbnailFromPath API if one does not need it.

MEDIUM · CVSS 6.8 EPSS 0.00366
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules2 YARA rules0
⬡

Weakness Classification

CWE-668Exposure of Resource to Wrong Sphere
CWE-862Missing Authorization
▤

Affected Products & Versions

4
electronjs electron>= 10.1.0 and < 11.5.0
electronjs electron>= 12.0.0 and < 12.1.0
electronjs electron>= 13.0.0 and < 13.3.0
electronjs electronall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm electron MODERATE fixed in 11.5.0
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumPotentially Suspicious Electron Application CommandLine
productmediumSuspicious Electron Application Child Processes
▣

Scoring & Timeline

6.8
MEDIUM · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 Oct 2021 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/electron/electron/pull/30728Third Party Advisory
https://github.com/electron/electron/security/advisories/GHSA-mpjm-v997-c4h4MitigationThird Party Advisory
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