CVE-2017-7755

Name: CVE-2017-7755
Creator: NVD / NIST
Published: 2018-06-11T21:29:07.967+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.41%

Last modified Jun 17, 2026

CVE-2017-7755 is a vulnerability of currently unknown severity. 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. EPSS estimates a 1.41% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

1.41%

69.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-426

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 52.2.0
Mozilla	Firefox	< 54.0
Mozilla	Thunderbird	< 52.2.0

References

http://www.securityfocus.com/bid/99057Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038689Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1361326Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-15/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-17/Vendor Advisory
http://www.securityfocus.com/bid/99057Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038689Third Party Advisory, VDB Entry
https://bugzilla.mozilla.org/show_bug.cgi?id=1361326Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-15/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2017-17/Vendor Advisory

Timeline

Published: Jun 11, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-7755?

How severe is CVE-2017-7755?

Severity scoring for CVE-2017-7755 is pending analysis. The EPSS model estimates a 1.41% probability of exploitation in the next 30 days.

How do I fix CVE-2017-7755?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-7755?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST