Inappropriate setting of the SEE_MASK_FLAG_NO_UI flag in file downloads in Google Chrome prior to 66.0.3359.117 allowed a remote attacker t…

published 2018-12-04 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17878

cvss: 6.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

Inappropriate setting of the SEE_MASK_FLAG_NO_UI flag in file downloads in Google Chrome prior to 66.0.3359.117 allowed a remote attacker to potentially bypass OS malware checks via a crafted HTML page.

Patch / fix

fixed in 1 distros 3

Google Chrome 66.0.3359.117

ubuntu opensuse arch linux

chromium-browser Ubuntu 16.04 LTS 66.0.3359.139-0ubuntu0.16.04.3
chromium-browser Ubuntu 18.04 LTS 66.0.3359.139-0ubuntu0.18.04.3

ubuntu advisories UBUNTU-CVE-2018-6115

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

chromium openSUSE Tumbleweed 93.0.4577.82-1.1
chromium openSUSE Tumbleweed 113.0.5672.92-1.1
chromium Package Hub 12 SP2 66.0.3359.181-55.1

opensuse advisories openSUSE-SU-2024:10681-1 openSUSE-SU-2024:12948-1 openSUSE-SU-2018:1175-1 openSUSE-SU-2018:1437-1

chromium Arch Linux 66.0.3359.117-1

arch linux advisories AVG-678

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-6115 updated 2026-11-07 cvss 4.3

chromium-browser: SmartScreen bypass in downloads

Red Hat Enterprise Linux 6 chromium-browser
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

Google Chrome

Classification

Weakness

CWE-20 Improper Input Validation

Technology feeds

Google Chrome rss critical rss

References

security.gentoo.org /glsa/201804-22
vendor-advisory
chromereleases.googleblog.com /2018/04/stable-channel-update-for-desktop.html
crbug.com /819809
securityfocus.com /bid/103917
vdb-entry

Sources

CVE List CVE-2018-6115
NVD CVE-2018-6115

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