CVE-2018-5174
In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2018-5174- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2018-5174- Updated
- 2026-11-02
EUVDEUVD-2018-16959 No score
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.
- Record
EUVD-2018-16959- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cx2r-fxw7-w76f
In the Windows 10 April 2018 Update, Windows Defender SmartScreen honors the "SEE_MASK_FLAG_NO_UI...
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.
- Record
GHSA-cx2r-fxw7-w76f- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10600-1 No score
MozillaFirefox-92.0-1.2 on GA media
These are all security issues fixed in the MozillaFirefox-92.0-1.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10600-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10601-1 No score
MozillaThunderbird-91.1.1-1.1 on GA media
These are all security issues fixed in the MozillaThunderbird-91.1.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10601-1- Updated
- 2026-11-02
Show 5 moreShow less
OSVopenSUSE-SU-2024:14572-1 No score
firefox-esr-128.5.1-1.1 on GA media
These are all security issues fixed in the firefox-esr-128.5.1-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:14572-1- Updated
- 2026-11-02
OSVSUSE-SU-2018:1319-1 No score
Security update for MozillaFirefox
This update for MozillaFirefox to ESR 52.8 release fixes the following issues:
Update to Firefox ESR 52.8 (bsc#1092548)
Security issues fixed:
- MFSA 2018-12/CVE-2018-5159: Integer overflow and out-of-bounds write in Skia
- MFSA 2018-12/CVE-2018-5158: Malicious PDF can inject JavaScript into PDF Viewer
- MFSA 2018-12/CVE-2018-5168: Lightweight themes can be installed without user interaction
- MFSA 2018-12/CVE-2018-5150: Memory safety bugs fixed in Firefox 60 and Firefox ESR 52.8
- MFSA 2018-12/CVE-2018-5155: Use-after-free with SVG animations and text paths
- MFSA 2018-12/CVE-2018-5183: Backport critical security fixes in Skia
- MFSA 2018-12/CVE-2018-5157: Same-origin bypass of PDF Viewer to view protected PDF files
- MFSA 2018-12/CVE-2018-5154: Use-after-free with SVG animations and clip paths
- MFSA 2018-12/CVE-2018-5178: Buffer overflow during UTF-8 to Unicode string conversion through legacy extension
- Record
SUSE-SU-2018:1319-1- Updated
- 2026-11-02
OSVSUSE-SU-2018:1334-1 No score
Security update for MozillaFirefox
This update for MozillaFirefox to the ESR 52.8 release fixes the following issues:
Mozil to Firefox ESR 52.8 (bsc#1092548)
Security issues fixed:
- MFSA 2018-12/CVE-2018-5159: Integer overflow and out-of-bounds write in Skia
- MFSA 2018-12/CVE-2018-5158: Malicious PDF can inject JavaScript into PDF Viewer
- MFSA 2018-12/CVE-2018-5168: Lightweight themes can be installed without user interaction
- MFSA 2018-12/CVE-2018-5150: Memory safety bugs fixed in Firefox 60 and Firefox ESR 52.8
- MFSA 2018-12/CVE-2018-5155: Use-after-free with SVG animations and text paths
- MFSA 2018-12/CVE-2018-5183: Backport critical security fixes in Skia
- MFSA 2018-12/CVE-2018-5157: Same-origin bypass of PDF Viewer to view protected PDF files
- MFSA 2018-12/CVE-2018-5154: Use-after-free with SVG animations and clip paths
- MFSA 2018-12/CVE-2018-5178: Buffer overflow during UTF-8 to Unicode string conversion through legacy extension
- Record
SUSE-SU-2018:1334-1- Updated
- 2026-11-02
OSVSUSE-SU-2018:1334-2 No score
Security update for MozillaFirefox
This update for MozillaFirefox to the ESR 52.8 release fixes the following issues:
Mozil to Firefox ESR 52.8 (bsc#1092548)
Security issues fixed:
- MFSA 2018-12/CVE-2018-5159: Integer overflow and out-of-bounds write in Skia
- MFSA 2018-12/CVE-2018-5158: Malicious PDF can inject JavaScript into PDF Viewer
- MFSA 2018-12/CVE-2018-5168: Lightweight themes can be installed without user interaction
- MFSA 2018-12/CVE-2018-5150: Memory safety bugs fixed in Firefox 60 and Firefox ESR 52.8
- MFSA 2018-12/CVE-2018-5155: Use-after-free with SVG animations and text paths
- MFSA 2018-12/CVE-2018-5183: Backport critical security fixes in Skia
- MFSA 2018-12/CVE-2018-5157: Same-origin bypass of PDF Viewer to view protected PDF files
- MFSA 2018-12/CVE-2018-5154: Use-after-free with SVG animations and clip paths
- MFSA 2018-12/CVE-2018-5178: Buffer overflow during UTF-8 to Unicode string conversion through legacy extension
- Record
SUSE-SU-2018:1334-2- Updated
- 2026-11-02
OSVSUSE-SU-2019:2872-1 No score
Security update for MozillaFirefox
This update for MozillaFirefox to 68.2.0 ESR fixes the following issues:
Mozilla Firefox was updated to version 68.2.0 ESR (bsc#1154738).
Security issues fixed:
- CVE-2019-15903: Fixed a heap overflow in the expat library (bsc#1149429).
- CVE-2019-11757: Fixed a use-after-free when creating index updates in IndexedDB (bsc#1154738).
- CVE-2019-11758: Fixed a potentially exploitable crash due to 360 Total Security (bsc#1154738).
- CVE-2019-11759: Fixed a stack buffer overflow in HKDF output (bsc#1154738).
- CVE-2019-11760: Fixed a stack buffer overflow in WebRTC networking (bsc#1154738).
- CVE-2019-11761: Fixed an unintended access to a privileged JSONView object (bsc#1154738).
- CVE-2019-11762: Fixed a same-origin-property violation (bsc#1154738).
- CVE-2019-11763: Fixed an XSS bypass (bsc#1154738).
- CVE-2019-11764: Fixed several memory safety bugs (bsc#1154738).
Non-security issues fixed:
- Firefox 60.7 ESR changed the user interface language (bsc#1137990).
- Wrong Firefox GUI Language (bsc#1120374).
- Fixed an inadvertent crash report transmission without user opt-in (bsc#1074235).
- Firefox hangs randomly when browsing and scrolling (bsc#1043008).
- Firefox stops loading page until mouse is moved (bsc#1025108).
- Record
SUSE-SU-2019:2872-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
MozillaFirefoxSUSE:Linux Enterprise Software Development Kit 11 SP4 From an advisory covering 10 CVEs |
before 52.8.0esr-72.32.1 | 52.8.0esr-72.32.1 |
MozillaFirefoxSUSE:Linux Enterprise Point of Sale 11 SP3 From an advisory covering 10 CVEs |
before 52.8.0esr-72.32.1 | 52.8.0esr-72.32.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 11 SP3-LTSS From an advisory covering 10 CVEs |
before 52.8.0esr-72.32.1 | 52.8.0esr-72.32.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 11 SP3-TERADATA From an advisory covering 10 CVEs |
before 52.8.0esr-72.32.1 | 52.8.0esr-72.32.1 |
MozillaFirefoxSUSE:Linux Enterprise Server 11 SP4 From an advisory covering 10 CVEs |
before 52.8.0esr-72.32.1 | 52.8.0esr-72.32.1 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 11 SP4 From an advisory covering 10 CVEs |
before 52.8.0esr-72.32.1 | 52.8.0esr-72.32.1 |
MozillaFirefoxSUSE:OpenStack Cloud 7 From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Desktop 12 SP3 From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP1 From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP2 From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
Show 31 moreShow less
| Package | Affected | Fixed |
|---|---|---|
MozillaFirefoxSUSE:Linux Enterprise Software Development Kit 12 SP3 From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12-LTSS From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP1-LTSS From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP2-LTSS From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP3 From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP3 From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Enterprise Storage 4 From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP2-BCL From an advisory covering 10 CVEs |
before 52.8.0esr-109.31.2 | 52.8.0esr-109.31.2 |
MozillaFirefoxSUSE:HPE Helion OpenStack 8 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:OpenStack Cloud 7 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:OpenStack Cloud 8 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:OpenStack Cloud Crowbar 8 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Desktop 12 SP4 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP1 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP2 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP3 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Software Development Kit 12 SP4 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Software Development Kit 12 SP5 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP1-LTSS From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP2-LTSS From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP2-BCL From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP3-LTSS From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP3-BCL From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP4 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP4 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server 12 SP5 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Linux Enterprise Server for SAP Applications 12 SP5 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxSUSE:Enterprise Storage 5 From an advisory covering 51 CVEs |
before 68.2.0-109.95.2 | 68.2.0-109.95.2 |
MozillaFirefoxopenSUSE:Tumbleweed From an advisory covering 661 CVEs |
before 92.0-1.2 | 92.0-1.2 |
MozillaThunderbirdopenSUSE:Tumbleweed From an advisory covering 394 CVEs |
before 91.1.1-1.1 | 91.1.1-1.1 |
firefox-esropenSUSE:Tumbleweed From an advisory covering 1860 CVEs |
before 128.5.1-1.1 | 128.5.1-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-5174 is a high vulnerability (CVSS 7.5) in Mozilla Firefox, published May 16, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.81%, the 78th percentile. No source names a fixed version.
References
bugzilla.mozilla.org/show_bug.cgi?id=1447080
mozilla.org/security/advisories/mfsa2018-13
securitytracker.com/id/1040896
securityfocus.com/bid/104136
Show 194 moreShow less
nvd.nist.gov/vuln/detail/CVE-2018-5174
github.com/advisories/GHSA-cx2r-fxw7-w76f
suse.com/support/update/announcement/2018/suse-su-20181319-1
bugzilla.suse.com/1092548
lists.opensuse.org/archives/list/[email protected]/thread/3HI2RC7AJAHY74Q6MK7GNGWU6TITB22V
Left out here: 1,785 references. The JSON record has them.