The destructor function for the "WindowsDllDetourPatcher" class can be re-purposed by malicious code in concert with another vulnerability…

published 2018-06-11 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16779

cvss: 7.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.5%; EPSS 1.5% chance of exploitation in 30 days, percentile 73%
public exploits: 0; none known

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.

Patch / fix

fixed in 3 distros 2

Mozilla Thunderbird 52.3
Mozilla Firefox ESR 52.3
Mozilla Firefox 55

suse opensuse

MozillaFirefox SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for SAP 12 SP1 +10 more 52.3.0esr-109.3.1
MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.3.0esr-72.9.1
MozillaFirefox-branding-SLED SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 52-24.5.1

suse advisories SUSE-SU-2017:2589-1 SUSE-SU-2017:2302-1

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 92.0-1.2
MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
MozillaThunderbird Package Hub 12 52.3.0-42.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:10600-1 openSUSE-SU-2024:10601-1 openSUSE-SU-2017:2209-1

Exploit prediction

1.46% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:P/A:N

Affected products

Mozilla Thunderbird
Mozilla Firefox ESR
Mozilla Firefox

Classification

Weakness

CWE-20 Improper Input Validation

References

mozilla.org /security/advisories/mfsa2017-19/
vendor-advisory
mozilla.org /security/advisories/mfsa2017-20/
vendor-advisory
mozilla.org /security/advisories/mfsa2017-18/
vendor-advisory
securityfocus.com /bid/100234
vdb-entry, third-party-advisory
securitytracker.com /id/1039124
vdb-entry, third-party-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1372849
issue-tracking, third-party-advisory

Sources

CVE List CVE-2017-7804
NVD CVE-2017-7804

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary