CVE-2026-53920High· 8.7▾ Twilightodhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. From version 17.01.0 to before version 25.12.3, odhcpd's DHCPv6 IA parser accepts an IA_NA or IA_PD option whose body is shorter than struct dhcpv6_ia_hdr, ca…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 47.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. From version 17.01.0 to before version 25.12.3, odhcpd's DHCPv6 IA parser accepts an IA_NA or IA_PD option whose body is shorter than struct dhcpv6_ia_hdr, casts the option header to that full structure, and reads ia->iaid before proving that the IA body contains the IAID field. If an unauthenticated network-adjacent client places a zero-length or otherwise short IA option at the end of odhcpd's 8192-byte receive stack buffer, the IAID read crosses from data_buf into adjacent stack memory. The disclosed bytes are then reflected in the DHCPv6 reply IAID; prior ARM validation showed data_buf[8192:8196] disclosing the saved stack canary, and wider stack scans can leak ASLR-useful stack/process contents. This issue has been patched in version 25.12.3.
odhcpd >= 17.01.0, < 25.12.3Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-55606Medium· 6.5odhcpd: Stack buffer overread via DUID length endianness mismatch in memcmp()
CVE-2026-53921Critical· 9.8odhcpd: Stack buffer overflow in DHCPv6 IA reply serialization (2 independent sites)
CVE-2026-53918High· 8.8odhcpd DHCPv6 IA dangling first pointer use-after-free
CVE-2026-53922Medium· 6.5odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt
CVE-2022-2175High· 7.8Buffer Over-read in GitHub repository vim/vim prior to 8.2.
CVE-2022-2124High· 7.8Buffer Over-read in GitHub repository vim/vim prior to 8.2.