CVE-2017-7789
Mozilla: Failure to enable HSTS when two STS headers are sent for a connection (MFSA 2017-18)
Severity
LowRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · August 8, 2017
Updated · November 22, 2025
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.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE-285 · Improper Authorization