What’s Vulnerable › Vulnerabilities

CVE-2017-7782

• Severity: medium (CVSS 5.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-06-11 · updated 2026-06-17
• Weakness: CWE-269

Description

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; before 55.0 — fixed in 52.3.0, 55.0
• Mozilla Thunderbird: before 52.3.0 — fixed in 52.3.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 52.3.0, 55.0; Mozilla Thunderbird 52.3.0. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/100243
• http://www.securitytracker.com/id/1039124
• https://bugzilla.mozilla.org/show_bug.cgi?id=1344034
• https://www.mozilla.org/security/advisories/mfsa2017-18/
• https://www.mozilla.org/security/advisories/mfsa2017-19/
• https://www.mozilla.org/security/advisories/mfsa2017-20/
• http://www.securityfocus.com/bid/100243
• http://www.securitytracker.com/id/1039124
• https://bugzilla.mozilla.org/show_bug.cgi?id=1344034
• https://www.mozilla.org/security/advisories/mfsa2017-18/
• https://www.mozilla.org/security/advisories/mfsa2017-19/
• https://www.mozilla.org/security/advisories/mfsa2017-20/

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