CVE-2018-5174: mozilla firefox
Vulnerability summary
CVE-2018-5174 is a high (CVSS 7.5) vulnerability in mozilla firefox. EPSS estimates a 1.81% chance of exploitation in the next 30 days, higher than 78.2% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 11-06-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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 metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
1.81%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
-0.04 pp
From 1.85% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Mozilla4 products
- firefox≥ unspecified, < 60 | < 52.8.0 | < 60.0
- firefox_esr≥ unspecified, < 52.8
- thunderbird≥ unspecified, < 52.8 | < 52.8.0
- thunderbird_esr≥ unspecified, < 52.8 | < 52.8.0
1 vendor · 4 products
References
6 links- bugzilla.mozilla.org/show_bug.cgi?id=1447080X Refsource CONFIRMIssue TrackingPermissions RequiredThird Party Advisory