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CVE-2019-11747 PUBLISHED

The "Forget about this site" feature in the History pane is intended to remove all saved user data that indicates a user has visited a site. This includes removing any HTTP Strict Transport Security (HSTS) settings received from sites that use it. Due to a bug, sites on the pre-load list also have their HSTS setting removed. On the next visit to that site if the user specifies an http: URL rather than secure https: they will not be protected by the pre-loaded HSTS setting. After that visit the site's HSTS setting will be restored. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.

EPSS 0.35% · 57.4th percentile

Risk Scores

EPSS Score
0.35%
57.4th percentile

Affected Products

VendorProductVersions
Ubuntu:20.04:LTSmozjs5252.9.1-1ubuntu3, 52.9.1-1build1, 0
Ubuntu:16.04:LTSfirefox44.0+build3-0ubuntu2, 44.0.1+build1-0ubuntu1, 44.0.2+build1-0ubuntu1
Ubuntu:18.04:LTSmozjs3838.8.0~repack1-0ubuntu4, 0, 38.8.0~repack1-0ubuntu1
Ubuntu:18.04:LTSmozjs5252.8.1-0ubuntu0.18.04.1, 52.3.1-7fakesync1, 52.9.1-0ubuntu0.18.04.1
Ubuntu:18.04:LTSfirefox62.0+build2-0ubuntu0.18.04.5, 62.0.3+build1-0ubuntu0.18.04.1, 63.0+build2-0ubuntu0.18.04.2

Timeline

References

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