CVE-2016-5254 is a critical use-after-free vulnerability in the nsXULPopupManager::KeyDown function of Mozilla Firefox before version 48.0 and Firefox ESR 45.x before 45.3. This flaw allows remote attackers to execute arbitrary code or cause a denial of service through heap memory corruption and application crashes by manipulating the Alt key during top-level menu item selection. With a CVSS score of 9.8 (CRITICAL), it presents a severe risk due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. Despite its high severity, there is no evidence of active exploitation, no public exploit code available (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 47.0.1CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | ||
45.1.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:45.1.0:*:*:*:*:*:*:* | ||
45.1.1CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:45.1.1:*:*:*:*:*:*:* | ||
45.2.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:45.2.0:*:*:*:*:*:*:* | ||
45.3.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:45.3.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.