Loading vulnerability…
CVE-2026-40855 is an OS command-injection vulnerability in WNC T-Mobile 5G Box IDU router firmware versions before 1.1.0.651412. The router’s web-management ping diagnostic function incorporates user-controlled destination, packet-size, and iteration-count POST values into a system command without adequate validation or sanitization. An authenticated attacker can inject shell metacharacters or commands, resulting in arbitrary command execution in the router operating system with root privileges.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An authenticated OS command-injection vulnerability in the ping function of portal.cgi on WNC T-Mobile 5G Box IDU routers. Unsanitized ping parameters enable arbitrary shell-command execution as root.
An authenticated command-injection vulnerability in the WNC T-Mobile 5G Box IDU router's ping feature. Insufficient validation and sanitization of ping_ip, ping_size, and ping_times parameters at /cgi-bin/portal.cgi allows arbitrary shell-command execution and root-level system access.
A reported vulnerability in the firmware of WNC T-Mobile 5G Box IDU routers; no technical details are provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.