Description
ntop nDPI through 6.0 contains an out-of-bounds read vulnerability in dissect_softether_host_fqdn() in softether.c that compares host_name using the consumed byte count instead of data length. Remote attackers can send crafted short UDP datagrams on already-classified SoftEther flows, causing strncmp to read beyond the packet payload buffer.
Metrics
CVSS 3.1 5.3/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| ntop | nDPI | <= 6.0 |
References
- https://github.com/ntop/nDPI
- https://github.com/ntop/nDPI/blob/6.0/src/lib/protocols/softether.c#L203
- https://github.com/ntop/nDPI/commit/ca9d819151606377ac53305583fe819748c69be2
- https://github.com/ntop/nDPI/issues/3291
- https://github.com/ntop/nDPI/pull/3298
- https://hackmd.io/@haindpwn/ndpi-softether-host-fqdn-strncmp-oob-read
- https://www.vulncheck.com/advisories/ntop-ndpi-through-6.0-out-of-bounds-read-in-softether-dissector
Timeline
- Published
- Oct 26, 2026
- Last modified
- Oct 31, 2026
- NVD status
- Deferred