CVE-2020-15666

Public Exploit

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.

Category

6.5
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.37%
Vendor Advisory mozilla.org Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Firefox
Affected: Mozilla Firefox for Android
Published at:
Updated at:

References

Link Tags
https://www.mozilla.org/security/advisories/mfsa2020-39/ release notes vendor advisory
https://www.mozilla.org/security/advisories/mfsa2020-36/ release notes vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1450853 vendor advisory issue tracking exploit

Frequently Asked Questions

What is the severity of CVE-2020-15666?
CVE-2020-15666 has been scored as a medium severity vulnerability.
How to fix CVE-2020-15666?
To fix CVE-2020-15666, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-15666 being actively exploited in the wild?
It is possible that CVE-2020-15666 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-15666?
CVE-2020-15666 affects Mozilla Firefox, Mozilla Firefox for Android.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.