CVE-2017-7789

MEDIUM

Firefox < 55.0 - HTTP Strict Transport Security Bypass via Duplicate STS Headers

Title source: llm
STIX 2.1

Description

If a server sends two Strict-Transport-Security (STS) headers for a single connection, they will be rejected as invalid and HTTP Strict Transport Security (HSTS) will not be enabled for the connection. This vulnerability affects Firefox < 55.

References (4)

Core 4
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/100374
Vendor Advisory x_refsource_confirm
https://www.mozilla.org/security/advisories/mfsa2017-18/
Exploit, Issue Tracking, Vendor Advisory x_refsource_confirm
https://bugzilla.mozilla.org/show_bug.cgi?id=1074642
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1039124

Scores

CVSS v3 5.3
EPSS 0.0077
EPSS Percentile 73.7%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Details

Status published
Products (1)
mozilla/firefox < 55.0
Published Jun 11, 2018
Tracked Since Feb 18, 2026