The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has raised fresh concerns about several outdated TP-Link router models that are being actively exploited by cybercriminals. Despite the flaw being identified years ago, it has re-emerged in recent attack campaigns, prompting its addition to CISA’s Known Exploited Vulnerabilities (KEV) catalog.
The security issue is a command injection vulnerability with a high severity rating of 8.8. It impacts three specific models: TP-Link TL-WR940N, TL-WR841N, and TL-WR740N. The flaw exists within the routers’ web-based management interface, where improperly validated input allows hackers to execute unauthorized commands directly on the devices. This makes it possible for attackers to gain control of the routers remotely if remote access is enabled, or locally if they’re on the same network.
Although this vulnerability has been publicly known for years, recent activity suggests that malicious actors are targeting these devices once again. According to cybersecurity researchers, the attack surface remains significant because these routers are still in use across many households and small offices.
CISA has mandated that all federal agencies remove the affected router models from their networks by July 7, 2025. It also strongly recommends that other organizations and individuals replace the devices to avoid potential exploitation.
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