Is CVE-2020-6809 in the CISA KEV catalog?

No. CVE-2020-6809 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-6809?

CVE-2020-6809 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-6809?

CVE-2020-6809 has an EPSS score of 1.43% (70th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-6809?

Upgrade firefox on debian unstable to 74.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2020-6809

HIGH

7.5

CVSS v3

NVD

Description

When a Web Extension had the all-urls permission and made a fetch request with a mode set to 'same-origin', it was possible for the Web Extension to read local files. This vulnerability affects Firefox < 74.

How to fix

Remediation Available

firefoxDebian

Fixed in:74.0-1CVE-2020-6809

firefoxUbuntu

Fixed in:74.0+build3-0ubuntu0.16.04.1USN-4299-1

Fixed in:74.0+build3-0ubuntu0.18.04.1USN-4299-1

DeveloperEditionWindows application

Affected:74.0Fixed in:74.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:74.0Fixed in:74.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

1.43%probability of exploitation in 30 days

70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

Vendor Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.