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CVE-2017-7767

The Mozilla Maintenance Service can be invoked by an unprivileged user to overwrite arbitrary files with junk data using the Mozilla…

Medium5.5EPSS 0.28%
Published
Updated
Reserved
Assigned by
mozilla

Description

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.

Scores

CVSS scores of CVE-2017-7767, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0Medium5.5CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
EPSS (exploitation in 30 days)
0.28% · top 80% of all CVEs (2 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

  • Privilege escalation and arbitrary file overwrites through Mozilla Windows Updater and Mozilla Maintenance Service
  • CWE-269 (opens in a new tab)

Affected products

  • Mozilla · Firefox ESR

    • affected unspecified – < 52.2

  • Mozilla · Firefox

    • affected unspecified – < 54

References (5)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .