| Title | D-Link DIR822A_101 A_101 Buffer Overflow |
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| Description | An unauthenticated command injection vulnerability exists in the `udhcpd` DHCP service used by D-Link DIR-822 A1 firmware. While processing a `DHCPREQUEST` packet, the server reads the client-supplied hostname from DHCP Option 12 and concatenates it into a shell command that is executed via `system()` without sanitization.
As a result, an attacker on the local network can send a crafted DHCP packet containing shell metacharacters in the hostname field and trigger arbitrary command execution on the router. |
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| Source | ⚠️ https://tzh00203.notion.site/D-Link-DIR-822-A1-Command-Injection-in-udhcpd-via-DHCP-Hostname-337b5c52018a80d9b638d0fa59969e6b |
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| User | tian (UID 93438) |
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| Submission | 04/07/2026 13:03 (3 months ago) |
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| Moderation | 04/26/2026 09:27 (19 days later) |
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| Status | Accepted |
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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 | 17 |
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