Mozilla: Addressbar spoofing with onblur event (MFSA 2017-12)
Published Jun 11, 2018
4.3
MEDIUMCVSS 3.0
EPSS 1.51%
Description
A mechanism to spoof the addressbar through the user interaction on the addressbar and the "onblur" event. The event could be used by script to affect text display to make the loaded site appear to be different from the one actually loaded within the addressbar. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 52.1, and Firefox < 53.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<53
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.1
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.1
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox | n/a |
| ||||||
| Mozilla | Firefox ESR | n/a |
| ||||||
| Mozilla | Thunderbird | n/a |
|
Configuration 1
- 6.0
- 7.0
- 6.0
- 7.0
- 6.0
- 7.0
- 7.3
- 7.4
- 7.3
- 7.4
- 7.5
- 6.0
- 7.0
Configuration 4
- < 52.1.0
No data.
Red Hat Enterprise Linux 6
thunderbird-0:52.1.0-1.el6_9
Fixed · RHSA-2017:1201
Red Hat Enterprise Linux 7
firefox-0:52.1.0-2.el7_3
Fixed · RHSA-2017:1106
Red Hat Enterprise Linux 7
thunderbird-0:52.1.0-1.el7_3
Fixed · RHSA-2017:1201
Red Hat Enterprise Linux 5
firefox
Will not fix
Red Hat Enterprise Linux 5
thunderbird
Will not fix
Red Hat Enterprise Linux 6
firefox
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | thunderbird-0:52.1.0-1.el6_9 | Fixed | RHSA-2017:1201 |
| Red Hat Enterprise Linux 7 | firefox-0:52.1.0-2.el7_3 | Fixed | RHSA-2017:1106 |
| Red Hat Enterprise Linux 7 | thunderbird-0:52.1.0-1.el7_3 | Fixed | RHSA-2017:1201 |
| Red Hat Enterprise Linux 5 | firefox | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | 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:R/S:U/C:N/I:L/A:N
AV:N/AC:M/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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.51% (0.01512) | 73.53th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.52% (0.01524) | 71.28th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.62% (0.00616) | 68.11th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.19% (0.00188) | 57.50th | v3 (v2023.03.01) |
| Nov 2, 2023 | 0.19% (0.00188) | 56.12th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.22% (0.00225) | 60.12th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.23% (0.00233) | 59.58th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.18% (0.01183) | 61.76th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.18% (0.01183) | 35.15th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.86% (0.01865) | 48.06th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.86% (0.01865) | 0.00th | v1 |
References (13)
- http://www.securityfocus.com/bid/97940 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038320 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2017:1106 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2017:1201 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2017-5451 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1273537 x_refsource_CONFIRMExploitIssue TrackingPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1443340 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-5451
- https://www.cve.org/CVERecord?id=CVE-2017-5451
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/#CVE-2017-5451
- https://www.mozilla.org/security/advisories/mfsa2017-10/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-12/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-13/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.