CVE-2016-4540 is a critical denial-of-service vulnerability affecting PHP versions before 5.5.35, 5.6.21, and 7.0.6, specifically within the grapheme_stripos function. This flaw allows remote attackers to trigger an out-of-bounds read via a negative offset, potentially leading to system instability or other unspecified impacts. With a CVSS score of 9.8, it is easily exploitable over the network with low complexity and no user interaction, granting high confidentiality, integrity, and availability impacts. While no public exploit code (Metasploit, Nuclei, ExploitDB) or active exploitation has been confirmed, the vulnerability has garnered significant community discussion, indicating awareness among security researchers.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
24CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:* | ||
42.1CPE matchmatch criteria | cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:* | ||
<= 5.5.34CPE matchmatch criteria | cpe:2.3:a:php:php:*:*:*:*:*:*:*:* | ||
5.6.0CPE matchmatch criteria | cpe:2.3:a:php:php:5.6.0:*:*:*:*:*:*:* | ||
5.6.1CPE matchmatch criteria | cpe:2.3:a:php:php:5.6.1:*:*:*:*:*:*:* |
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.