What’s Vulnerable › Vulnerabilities

CVE-2004-0257

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2004-11-23 · updated 2026-06-16

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.

Affected products

• Netbsd: 1.6, 1.6.1
• OpenBSD: 3.0, 3.1, 3.2, 3.3, 3.4

References

• 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
• http://www.osvdb.org/3825
• http://www.securityfocus.com/bid/9577
• https://exchange.xforce.ibmcloud.com/vulnerabilities/15044
• 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

Get alerted when CVE-2004-0257 or the next vulnerability affects your stack