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CVE-2026-71991 is a critical OS command injection vulnerability in MSI Radix AXE6600 router firmware version v781521. The flaw is present in the TelnetSSH function responsible for Telnet configuration, where attacker-controlled input supplied through the Telnet configuration interface is improperly neutralized before being incorporated into operating system commands. This allows specially crafted input to be injected into command execution flow, resulting in arbitrary command execution on the router. The vulnerability is remotely exploitable and can lead to execution with root privileges on the underlying system.
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No public exploit code observed for this vulnerability.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated remote OS command injection vulnerability in the Telnet configuration function of MSI Radix AXE6600 routers, enabling root-level command execution.
A critical remote command injection vulnerability in MSI Radix AXE6600 firmware v781521's TelnetSSH function that can allow remote attackers to execute arbitrary commands and obtain root privileges.
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.