| Title | D-Link DIR822A_101 A_101 Command Injection |
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| Description | A command injection vulnerability exists in the `udhcpcd` DHCP server of D-Link DIR-822A. The issue is located in the `sendACK()` path, where the server reads a client-controlled DHCP hostname from `Option 12`, concatenates it into a shell command for the TR-069 host helper, and executes the resulting string with `system()`.
Because the vulnerable path is reachable by an unauthenticated DHCP client on the local network, a remote attacker on the LAN can execute arbitrary commands as root by sending a crafted DHCP request containing a malicious hostname. |
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| Source | ⚠️ https://tzh00203.notion.site/D-Link-DIR-822A-Command-Injection-in-udhcpd-sendACK-TR-069-Host-Helper-33cb5c52018a80a3a343c2d626b46078?source=copy_link |
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| User | tian (UID 93438) |
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| Submission | 07/27/2026 11:24 (1 month ago) |
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| Moderation | 09/06/2026 18:05 (1 month later) |
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| Status | Duplicate |
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| VulDB entry | 359642 [D-Link DIR-822 A_101 udhcpd DHCP Service /udhcpcd/dhcpd.c system Hostname command injection] |
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| Points | 0 |
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