Mozilla: Failure to enable HSTS when two STS headers are sent for a connection (MFSA 2017-18)
Published Jun 11, 2018
5.3
MEDIUMCVSS 3.0
EPSS 1.78%
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.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<55
- Version
No data.
Red Hat Enterprise Linux 6
firefox
Not affected
Red Hat Enterprise Linux 7
firefox
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 7 | firefox | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
AV:N/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.78% (0.01784) | 77.48th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.78% (0.01784) | 75.34th | v5 (v2026.06.15) |
| Mar 30, 2025 | 1.11% (0.01109) | 76.16th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.58% (0.02585) | 75.95th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.15% (0.00146) | 50.92th | v3 (v2023.03.01) |
| Nov 2, 2023 | 0.15% (0.00146) | 50.30th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.18% (0.00175) | 53.97th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.23% (0.00227) | 59.05th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.04% (0.01040) | 28.32th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.04% (0.01040) | 0.00th | v1 |
References (9)
- http://www.securityfocus.com/bid/100374 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039124 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2017-7789 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1074642 x_refsource_CONFIRMExploitIssue TrackingVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1479208 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-7789
- https://www.cve.org/CVERecord?id=CVE-2017-7789
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/#CVE-2017-7789
- https://www.mozilla.org/security/advisories/mfsa2017-18/ x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/100374 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1039124 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2017-7789 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1074642 | x_refsource_CONFIRMExploitIssue TrackingVendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1479208 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-7789 | ||
| https://www.cve.org/CVERecord?id=CVE-2017-7789 | ||
| https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/#CVE-2017-7789 | ||
| https://www.mozilla.org/security/advisories/mfsa2017-18/ | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.