How severe is CVE-2020-4077?

CVE-2020-4077 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-4077 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4077?

CVE-2020-4077 primarily affects Electronjs Electron. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-4077?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-4077 published?

CVE-2020-4077 was published on 2020-07-07 and last updated on 2026-06-17.

CVE-2020-4077

CVE-2020-4077 is a high-severity vulnerability in Electronjs Electron with a CVSS 3.x base score of 7.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-501.

Key facts

Severity: High (CVSS 3.x base score 7.7)
CVSS v2: 6.5
EPSS exploit prediction: 1% (59th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-501
Affected product: Electronjs Electron
Published: 2020-07-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-4077?: 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.
How severe is CVE-2020-4077?: CVE-2020-4077 has a CVSS 3.x base score of 7.7, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-4077 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4077?: CVE-2020-4077 primarily affects Electronjs Electron. In total, 22 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-4077?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-4077 published?: CVE-2020-4077 was published on 2020-07-07 and last updated on 2026-06-17.

References

Affected products (22)

cpe:2.3:a:electronjs:electron:*:*:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:-:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta1:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta10:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta11:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta12:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta13:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta14:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta15:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta16:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta17:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta18:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta19:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta2:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta20:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta3:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta4:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta5:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta6:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta7:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta8:*:*:*:*:*:*
cpe:2.3:a:electronjs:electron:9.0.0:beta9:*:*:*:*:*:*

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