Is CVE-2020-15666 in the CISA KEV catalog?

No. CVE-2020-15666 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-15666?

CVE-2020-15666 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2020-15666?

CVE-2020-15666 has an EPSS score of 1.23% (65th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-15666?

Upgrade firefox on debian unstable to 80.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2020-15666

MEDIUM

6.5

CVSS v3

NVD

Description

When trying to load a non-video in an audio/video context the exact status code (200, 302, 404, 500, 412, 403, etc.) was disclosed via the MediaError Message. This level of information leakage is inconsistent with the standardized onerror/onsuccess disclosure and can lead to inferring login status to services or device discovery on a local network among other attacks. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

CWE-209

How to fix

Remediation Available

firefoxDebian

Fixed in:80.0-1CVE-2020-15666

firefoxUbuntu

Fixed in:80.0+build2-0ubuntu0.16.04.1USN-4474-1

Fixed in:80.0+build2-0ubuntu0.18.04.1USN-4474-1

Fixed in:80.0+build2-0ubuntu0.20.04.1USN-4474-1

DeveloperEditionWindows application

Affected:80.0Fixed in:80.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:80.0Fixed in:80.0Mozilla

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

1.23%probability of exploitation in 30 days

65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

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.