CVE-2017-7789

Public Exploit

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.

5.3

CVSS

Severity: Medium

CVSS 3.0 •

CVSS 2.0 •

EPSS 0.93% Top 30%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

References

Link	Tags
http://www.securityfocus.com/bid/100374	third party advisory vdb entry
https://www.mozilla.org/security/advisories/mfsa2017-18/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1074642	vendor advisory issue tracking exploit
http://www.securitytracker.com/id/1039124	third party advisory vdb entry

Frequently Asked Questions

What is the severity of CVE-2017-7789?: CVE-2017-7789 has been scored as a medium severity vulnerability.
How to fix CVE-2017-7789?: To fix CVE-2017-7789, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-7789 being actively exploited in the wild?: It is possible that CVE-2017-7789 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-7789?: CVE-2017-7789 affects Mozilla Firefox.

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