CVE-2018-5174

mediumpriority · track · 31EPSS 0.018 · 78 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.81% (78th) EPSS

CVSS 5 · medium

Is it mine?

13 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI" flag associated with downloaded files and will not show any UI. Files that are unknown and potentially dangerous will be allowed to run because SmartScreen will not prompt the user for a decision, and if the user is offline all files will be allowed to be opened because Windows won't prompt the user to ask what to do. Firefox incorrectly sets this flag when downloading files, leading to less secure behavior from SmartScreen. Note: this issue only affects Windows 10 users running the April 2018 update or later. It does not affect other Windows users or other operating systems. This vulnerability affects Thunderbird < 52.8, Thunderbird ESR < 52.8, Firefox < 60, and Firefox ESR < 52.8.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.07.5highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.06.9mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.16.5mediumAV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:Nsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-254US

affected products (13)

Products and version ranges known to be affected.

Mozilla Firefoxunspecified → 60enisa_euvdEU
Mozilla Firefox ESRunspecified → 52.8enisa_euvdEU
Mozilla Thunderbirdunspecified → 52.8enisa_euvdEU
Mozilla Thunderbird ESRunspecified → 52.8enisa_euvdEU
Mozilla Corp. Firefox≤ 60fstec_bduRU
Mozilla Corp. Firefox ESR≤ 52.8.0fstec_bduRU
Mozilla Corp. Thunderbird≤ 52.8.0fstec_bduRU
Mozilla Corp. Thunderbird ESR≤ 52.8.0fstec_bduRU
АО «ИВК» Альт Линукс СПТ≤ 7.0fstec_bduRU
mozilla firefox< 52.8.0nvdUScpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla firefox< 60.0nvdUScpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
mozilla thunderbird< 52.8.0nvdUScpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
mozilla thunderbird esr< 52.8.0nvdUScpe:2.3:a:mozilla:thunderbird_esr:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2018-06-11modified 2026-06-17

references (21)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan