What’s Vulnerable › Vulnerabilities

CVE-2017-7804

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% 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-20

Description

The destructor function for the "WindowsDllDetourPatcher" class can be re-purposed by malicious code in concert with another vulnerability to write arbitrary data to an attacker controlled location in memory. This can be used to bypass existing memory protections in this situation. 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/100234
• http://www.securitytracker.com/id/1039124
• https://bugzilla.mozilla.org/show_bug.cgi?id=1372849
• 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/100234
• http://www.securitytracker.com/id/1039124
• https://bugzilla.mozilla.org/show_bug.cgi?id=1372849
• 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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