CVE-2020-15666

6.5 mediumEPSS 1.2%

Medium (6.5) in mozilla. EPSS 1.2% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.5 medium

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

EPSS: 1.2% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-31)
CWE: CWE-209
Published: 2020-10-01
Modified: 2026-08-19
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox
mozilla:firefox_mobile

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1450853
https://www.mozilla.org/security/advisories/mfsa2020-36/
https://www.mozilla.org/security/advisories/mfsa2020-39/
https://bugzilla.mozilla.org/show_bug.cgi?id=1450853
https://www.mozilla.org/security/advisories/mfsa2020-36/

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