{"cve":"CVE-2004-0257","nvd":{"published":"2004-11-23T05:00:00.000","modified":"2026-06-16T22:05:16.100","status":"Modified","description":"OpenBSD 3.4 and NetBSD 1.6 and 1.6.1 allow remote attackers to cause a denial of service (crash) by sending an IPv6 packet with a small MTU to a listening port and then issuing a TCP connect to that port.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2004-002.txt.asc","http://lists.grok.org.uk/pipermail/full-disclosure/2004-February/016704.html","http://marc.info/?l=bugtraq&m=107604603226564&w=2","http://www.guninski.com/obsdmtu.html","http://www.openbsd.org/cgi-bin/cvsweb/src/sys/netinet6/ip6_output.c"],"products":["netbsd:netbsd","openbsd:openbsd"],"source":"nvd","synced_at":"2026-10-19T19:37:11.487553034+00:00"},"epss":{"cve":"CVE-2004-0257","score":0.02473,"percentile":0.84531,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}