Is CVE-2017-7766 in the CISA KEV catalog?

No. CVE-2017-7766 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-7766?

CVE-2017-7766 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2017-7766?

CVE-2017-7766 has an EPSS score of 0.38% (30th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-7766?

Upgrade DeveloperEdition to 52.2.0 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2017-7766

HIGH

7.8

CVSS v3

NVD

Description

An attack using manipulation of "updater.ini" contents, used by the Mozilla Windows Updater, and privilege escalation through the Mozilla Maintenance Service to allow for arbitrary file execution and deletion by the 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.

How to fix

Remediation Available

DeveloperEditionWindows application

Affected:52.2.0Fixed in:52.2.0Mozilla

Affected:54.0Fixed in:54.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:52.2.0Fixed in:52.2.0Mozilla

Affected:54.0Fixed in:54.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.38%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-25.