Nmap through 7.99 does not keep the IPv6 extension-header walk within the captured packet in ipv6_get_data_primitive…
[email protected]·CWE-191·Published 2026-06-28
Nmap through 7.99 does not keep the IPv6 extension-header walk within the captured packet in ipv6_get_data_primitive (libnetutil/netutil.cc), so the pointer advances past the buffer and the remaining-length computation underflows to a large value. A scanned target or on-path attacker returning a crafted IPv6 response with a truncated extension header can trigger out-of-bounds reads and a crash during raw IPv6 scans.
Nmap through 7.99 does not keep the IPv6 extension-header walk within the captured packet in ipv6_get_data_primitive (libnetutil/netutil.cc), so the pointer advances past the buffer and the remaining-length computation underflows to a large value. A scanned target or on-path attacker returning a crafted IPv6 response with a truncated extension header can trigger out-of-bounds reads and a crash during raw IPv6 scans.
Nmap hasta la versión 7.99 no mantiene el recorrido del encabezado de extensión IPv6 dentro del paquete capturado en ipv6_get_data_primitive (libnetutil/netutil.cc), por lo que el puntero avanza más allá del búfer y el cálculo de la longitud restante sufre un desbordamiento negativo a un valor grande. Un objetivo escaneado o un atacante en la ruta que devuelve una respuesta IPv6 manipulada con un encabezado de extensión truncado puede desencadenar lecturas fuera de límites y un fallo durante los escaneos IPv6 sin procesar.
| Version | Type | Source | Base | Exp | Impact | Vector |
|---|---|---|---|---|---|---|
| 3.1 | Primary | cve.org | 6.5 | — | — | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| 3.1 | Primary | NVD | 6.5 | 3.9 | 2.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| 3.1 | Secondary | NVD | 6.5 | 3.9 | 2.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| 4.0 | Primary | cve.org | 6.9 | — | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N |
| 4.0 | Secondary | ENISA EUVD | 6.9 | — | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N |
| 4.0 | Secondary | NVD | 6.9 | — | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/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 |