CVE-2019-9794: mozilla firefox Argument Injection
Vulnerability summary
CVE-2019-9794 is a critical (CVSS 9.8) Argument Injection vulnerability in mozilla firefox. EPSS estimates a 1.77% chance of exploitation in the next 30 days, higher than 77.8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 9 · Related 8Timeline
- 26-04-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A vulnerability was discovered where specific command line arguments are not properly discarded during Firefox invocation as a shell handler for URLs. This could be used to retrieve and execute files whose location is supplied through these command line arguments if Firefox is configured as the default URI handler for a given URI scheme in third party applications and these applications insufficiently sanitize URL data. *Note: This issue only affects Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.77%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
0.00 pp
From 1.77% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mozilla3 products
- firefox≥ unspecified, < 66 | < 60.6.0 | < 66.0
- firefox_esr≥ unspecified, < 60.6
- thunderbird≥ unspecified, < 60.6 | < 60.6.0
Ubuntu2 products
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
2 vendors · 5 products
References
9 links- bugzilla.mozilla.org/show_bug.cgi?id=1530103X Refsource MISCIssue TrackingPermissions RequiredVendor Advisory