CVE-2019-9803 describes a vulnerability in Firefox versions prior to 66 where the browser fails to correctly upgrade insecure HTTP requests to HTTPS, despite a Content Security Policy (CSP) enforcing Upgrade-Insecure-Requests (UIR). This flaw allows for potential man-in-the-middle (MitM) attacks on linked resources, as Firefox incorrectly navigates to the HTTP URL. The vulnerability carries a CVSS score of 7.4 (HIGH) due to its network-based attack vector and high impact on confidentiality and integrity, though it requires high attack complexity. Currently, there is no known active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 66.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | ||
< 66CPE match | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
No social media mentions found for this CVE.
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.