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    CVE-2004-0257

    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.

    Published:Sep 1, 2004
    Last Modified:Apr 16, 2026
    EPS:Sep 1, 2004
    EPSS Score:0.02029
    CVSS Score:5

    Affected Products

    Vendor
    Netbsd
    Product
    Netbsd
    Vendor
    Openbsd
    Product
    Openbsd

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2021-45484 (CVSS 7.5) — In NetBSD through 9.2, the IPv6 fragment ID generation algorithm employs a weak cryptographic PRNG.…
    CVE-2021-45487 (CVSS 7.5) — In NetBSD through 9.2, the IPv4 ID generation algorithm does not use appropriate cryptographic measures.…
    CVE-2021-45488 (CVSS 7.5) — In NetBSD through 9.2, there is an information leak in the TCP ISN (ISS) generation algorithm.…
    CVE-2021-45489 (CVSS 7.5) — In NetBSD through 9.2, the IPv6 Flow Label generation algorithm employs a weak cryptographic PRNG.…
    CVE-2020-26139 (CVSS 5.3) — An issue was discovered in the kernel in NetBSD 7.1. An Access Point (AP) forwards EAPOL frames to other clien…
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    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
    http://www.osvdb.org/3825
    http://www.securityfocus.com/bid/9577
    https://exchange.xforce.ibmcloud.com/vulnerabilities/15044
    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
    http://www.osvdb.org/3825
    http://www.securityfocus.com/bid/9577
    https://exchange.xforce.ibmcloud.com/vulnerabilities/15044

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High