CVE-2021-39184
No exploitation reported by the sources we read.
- Published2021-10-12
- Fixed in13.3.0 · 12.1.0 · 11.5.0
- WeaknessCWE-668 · CWE-862
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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.
Timeline
dates in UTC- 2021-10-1219:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-39184?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-39184?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD · OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 13.x | ≥ 13.0.0, < 13.3.0 | 13.3.0 | NVD · OSV |
| 12.x | ≥ 12.0.0, < 12.1.0 | 12.1.0 | NVD · OSV |
| 11.5 | ≥ 10.1.0, < 11.5.0 | 11.5.0 | NVD |
| 11.5 | < 11.5.0 | 11.5.0 | OSV |
| 14.0 | = 14.0.0 | no fix published | NVD |
| 15.0 | = 15.0.0 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Electronjs electron to 13.3.0 · 12.1.0 · 11.5.0
Advisories and patches
- github.comMitigation
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- Published
- 2021-10-12
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2021-39184?
Is CVE-2021-39184 actively exploited?
What is the CVSS score for CVE-2021-39184?
Running electron? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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