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CVE-2026-53921 is a critical stack buffer overflow in OpenWrt's odhcpd, affecting DHCPv6 Identity Association reply serialization. The flaw is triggerable by crafted DHCPv6 REQUEST packets and occurs while odhcpd processes DHCPv6 IA data and serializes the corresponding reply on the stack. Because the vulnerable code runs in a default-enabled core network service and is reachable over the network by a DHCPv6 client, the issue is remotely triggerable by a network-adjacent attacker without prior authentication. The vulnerability was addressed in OpenWrt by updating odhcpd to a newer upstream snapshot that included multiple DHCPv6 hardening and bounds-checking fixes.
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A critical stack buffer overflow in OpenWrt odhcpd's DHCPv6 IA reply serialization that can be triggered by a network-adjacent attacker using crafted DHCPv6 REQUEST packets.
An odhcpd vulnerability addressed by a set of DHCPv4/DHCPv6 hardening and memory-safety fixes in the OpenWrt 25.12 branch.
A specific vulnerability in odhcpd addressed in OpenWrt openwrt-25.12 with multiple DHCP-related validation and safety fixes; the content does not map the CVE to one exact sub-bug.
A critical stack buffer overflow in odhcpd DHCPv6 IA reply serialization that can be triggered by crafted DHCPv6 REQUEST packets from a network-adjacent unauthenticated attacker.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.