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[dos] LuCI DHCPv6 - Lease Hostname Stored Cross-Site Scripting
Stored cross-site scripting in OpenWrt LuCI via malicious DHCPv6 lease hostnames allows router interface attacks.
Exploit-DB entry 52637 describes a stored cross-site scripting vulnerability in LuCI, the OpenWrt web administration interface. A attacker on the local network can set a malicious hostname that gets stored in DHCPv6 lease data and rendered unsafely in the LuCI UI. When an administrator views the lease status page, the injected script executes in the router's management context.
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A Deep Dive Into Attempted Exploitation of CVE-2023
Mirai-like botnet scans exploit TP-Link EOL router flaw CVE-2023-33538 after CISA KEV addition, though observed exploit code is flawed.
Unit 42 observed large-scale automated scans attempting to exploit CVE-2023-33538 in end-of-life TP-Link TL-WR940N, TL-WR740N and TL-WR841N routers after CISA added the flaw to its KEV catalog in June 2025. HTTP GET requests inject commands via the ssid1 parameter at the /userRpm/WlanNetworkRpm endpoint to download and execute an arm7 ELF binary, a Mirai variant related to the Condi IoT botnet. Firmware emulation and reverse engineering showed the observed exploits are flawed and would fail, but the underlying vulnerability is real and successful exploitation requires authentication to the router's web interface. TP-Link confirmed the devices are end-of-life with no patches available and recommends replacing units and eliminating default credentials.
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