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CVE-2019-11751

27
FAUCET Score

CVE-2019-11751 is a high-severity vulnerability affecting Firefox on Windows, specifically versions prior to 69 and Firefox ESR prior to 68.1. It stems from improper sanitization of logging-related command line parameters, allowing an attacker to write log files to arbitrary locations, including the Windows 'Startup' folder, when Firefox is launched by another program. This could lead to high impact on confidentiality, integrity, and availability, with a CVSS score of 8.8. While there is no known active exploitation or public exploit code, the vulnerability has garnered some community discussion and media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 69.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
< 68.1.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.06%
Probability of exploitation in next 30 days
EPSS Percentile
61.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0106 is in the 61st percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2019-11751Critical

Mozilla: Malicious code execution through command line parameters

Sep 3, 2019

References

lists.opensuse.org / opensuse-security-announce/2019-10/msg00011.html
lists.opensuse.org / opensuse-security-announce/2019-10/msg00017.html
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingPermissions RequiredVendor Advisory
mozilla.org / security/advisories/mfsa2019-25
Vendor Advisory
mozilla.org / security/advisories/mfsa2019-26
Vendor Advisory