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CVE-2019-11747

MEDIUM
6.5
CVSS Score
Published: September 27, 2019 at 05:16 PM UTC
Updated: June 17, 2026 at 02:13 AM UTC
2 products affected across 1 vendorFirefoxFirefox ESR

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 69
Affected range stops below 69, so it looks safe — our inference, not a vendor statement
Affected range stops below 69.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 68.1
Affected range stops below 68.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 68.1.0, so it looks safe — our inference, not a vendor statement

References (5)

Vendor Advisoryx_refsource_SUSE
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
Vendor Advisoryx_refsource_SUSE
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1564481
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2019-25/
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2019-26/

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-665

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