No exploitation reportedFix available

CVE-2020-4077

Q: Is CVE-2020-4077 actively exploited?

Active exploitation of CVE-2020-4077 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-4077?

CVE-2020-4077 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2020-07-07
Fixed in8.2.4 · 7.2.4
WeaknessCWE-501

Am I 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

In Electron before versions 7.2.4, 8.2.4, and 9.0.0-beta21, there is a context isolation bypass. Code running in the main world context in the renderer can reach into the isolated Electron context and perform privileged actions. Apps using both `contextIsolation` and `contextBridge` are affected. This is fixed in versions 9.0.0-beta.21, 8.2.4 and 7.2.4.

Timeline

dates in UTC

2020-07-0700:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-4077?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-4077?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Electronjs electron

Branch	Affected	Fixed in	Source
8.x	≥ 8.0.0, < 8.2.4	8.2.4	NVD · OSV
7.x	≥ 7.0.0, < 7.2.4	7.2.4	NVD
7.2	< 7.2.4	7.2.4	OSV
9.0	= 9.0.0	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 8.2.4 · 7.2.4

Advisories and patches

www.electronjs.orgRelease Notes · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.17.7read 2026-10-23
NVDCVSS 3.19.9read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
CNAweakness (CWE)CWE-501read 2026-10-23
FIRST EPSSEPSS score1.0 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published: 2020-07-07
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-4077?

Is CVE-2020-4077 actively exploited?

Active exploitation of CVE-2020-4077 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-4077?

CVE-2020-4077 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

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