The Mozilla Maintenance Service "helper.exe" application creates a temporary directory writable by non-privileged users
Published Jun 11, 2018
5.5
MEDIUMCVSS 3.0
EPSS 0.31%
Description
The Mozilla Maintenance Service "helper.exe" application creates a temporary directory writable by non-privileged users. When this is combined with creation of a junction (a form of symbolic link), protected files in the target directory of the junction can be deleted by the Mozilla Maintenance Service, which has privileged access. Note: This attack requires local system access and only affects Windows. Other operating systems are not affected. This vulnerability affects Firefox ESR < 52.2 and Firefox < 54.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<54
- Version
-
- Version unspecifiedStatusaffectedConstraints<52.2
- 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 |
|
No data.
No Red Hat product state for this CVE.
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:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
AV:L/AC:L/Au:N/C:N/I:P/A:P
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 v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.31% (0.00311) | 21.68th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.31% (0.00311) | 22.58th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.07% (0.00068) | 18.26th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00059) | 26.84th | v3 (v2023.03.01) |
| Jun 7, 2024 | 0.06% (0.00059) | 24.77th | v3 (v2023.03.01) |
| Jun 5, 2023 | 0.06% (0.00059) | 22.76th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00046) | 14.06th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Sep 10, 2022 | 1.03% (0.01034) | 39.91th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.03% (0.01034) | 37.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.03% (0.01034) | 20.32th | v2 (v2022.01.01) |
| Feb 3, 2022 | 14.43% (0.14429) | 89.66th | v1 |
| Jan 6, 2022 | 14.43% (0.14429) | 89.55th | v1 |
| Sep 1, 2021 | 14.43% (0.14429) | 96.99th | v1 |
| Apr 14, 2021 | 14.43% (0.14429) | 0.00th | v1 |
References (6)
- http://www.securityfocus.com/bid/99057 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038689 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1215648 x_refsource_CONFIRMIssue TrackingVendor Advisory
- https://sourceforge.net/p/nsis/bugs/1125/ x_refsource_MISCIssue TrackingThird Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-15/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-16/ x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/99057 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1038689 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1215648 | x_refsource_CONFIRMIssue TrackingVendor Advisory | |
| https://sourceforge.net/p/nsis/bugs/1125/ | x_refsource_MISCIssue TrackingThird Party Advisory | |
| https://www.mozilla.org/security/advisories/mfsa2017-15/ | x_refsource_CONFIRMVendor Advisory | |
| https://www.mozilla.org/security/advisories/mfsa2017-16/ | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.