Is CVE-2017-7755 in the CISA KEV catalog?

No. CVE-2017-7755 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-7755?

CVE-2017-7755 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2017-7755?

CVE-2017-7755 has an EPSS score of 1.41% (69th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-7755?

Upgrade DeveloperEdition to 52.2.0 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2017-7755

HIGH

7.8

CVSS v3

NVD

Description

The Firefox installer on Windows can be made to load malicious DLL files stored in the same directory as the installer when it is run. This allows privileged execution if the installer is run with elevated privileges. Note: This attack only affects Windows operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

CWE-426

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:54.0Fixed in:54.0Mozilla

Affected:52.2.0Fixed in:52.2.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:52.2.0Fixed in:52.2.0Mozilla

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 RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.41%probability of exploitation in 30 days

69thpercentile

Moderate risk: more likely to be exploited than 69% of all known CVEs.

References

Vendor Advisory4

Third-Party Advisory2

Related Vulnerabilities

Other CWE-426 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-0096	High	9.3	71%	-	-
CVE-2016-10009	High	7.3	37%	-	Fix
CVE-2016-0016	High	7.8	31%	-	-
CVE-2012-1854	High	7.8	21%	KEV	-
CVE-2018-12589	High	7.8	20%	-	-
CVE-2022-22047	High	7.8	19%	KEV	Fix

Embed a live status badge for CVE-2017-7755

Markdown

[![CVE-2017-7755](https://tridentstack.com/cve/badge/CVE-2017-7755.svg)](https://tridentstack.com/cve/CVE-2017-7755)

HTML

<a href="https://tridentstack.com/cve/CVE-2017-7755"><img src="https://tridentstack.com/cve/badge/CVE-2017-7755.svg" alt="CVE-2017-7755"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.