EUVD-2026-27043CVSS VectorNVD
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
5DescriptionNVD
BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.
AnalysisAI
Heap buffer overflow in BusyBox udhcpc6 (DHCPv6 client) allows network-adjacent attackers to achieve remote code execution or denial of service on embedded systems. The vulnerability stems from incorrect heap buffer allocation in option_to_env() when parsing D6_OPT_DNS_SERVERS options in DHCPv6 responses. …
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RemediationAI
Within 24 hours: Identify all production systems running BusyBox with udhcpc6 enabled using network inventory and device management tools; document DHCPv6 environment (corporate networks, IoT deployments, edge devices). Within 7 days: Contact BusyBox vendors and OEM partners for patch timeline; evaluate whether DHCPv6 is required operationally and consider disabling on non-essential segments. …
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External POC / Exploit Code
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