CVE-2017-7767 json
The Mozilla Maintenance Service can be invoked by an unprivileged user to overwrite arbitrary files with junk data using the Mozilla Window…
published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16742
- cvss
- 5.5
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 20%
- public exploits
- 0
- none known
Summary
The Mozilla Maintenance Service can be invoked by an unprivileged user to overwrite arbitrary files with junk data using the Mozilla Windows Updater, which runs with the Maintenance Service's 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.
Patch / fix
- Mozilla Firefox ESR 52.2
- Mozilla Firefox 54
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 5.5 | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 2.1 | AV:L/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- Mozilla Firefox ESR
- Mozilla Firefox
Classification
- Weakness
-
- CWE-269 Improper Privilege Management
References
-
mozilla.org
/security/advisories/mfsa2017-15/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1336964
issue-tracking, vendor-advisory
-
mozilla.org
/security/advisories/mfsa2017-16/
vendor-advisory
-
securityfocus.com
/bid/99057
vdb-entry, third-party-advisory
-
securitytracker.com
/id/1038689
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2017-7767
- NVD CVE-2017-7767
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.