CVE-2017-7782: Mozilla Firefox

Medium severity, CVSS 5.3. EPSS: 1.1% chance of exploitation in the next 30 days.

An error in the "WindowsDllDetourPatcher" where a RWX ("Read/Write/Execute") 4k block is allocated but never protected, violating DEP protections. Note: This attack only affects Windows operating systems. Other operating systems are not affected. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

Affected products

• Mozilla Firefox: before 52.3.0 (fixed in 52.3.0); before 55.0 (fixed in 55.0)
• Mozilla Thunderbird: before 52.3.0 (fixed in 52.3.0)

Published 2018-06-11. Last modified 2026-06-17.