Nmap - Integer Underflow in IPv6 Extension Header Parsing
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.9epss 1.4%
from disclosure to weapon50 days
Published on NVDJun 28
1st PoC+50d
exploitation probability
1.4%top 31% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
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.
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
Affected products
Nmap · Nmappublic PoCs found — 2
exploitdbwww.exploit-db.com/exploits/52647unverifiedcve_referencegithub.com/bikini/exploitarium/tree/main/nmap-ipv6-extlen-wrap-pocunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.