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    CVE-2004-0551

    Cisco CatOS 5.x before 5.5(20) through 8.x before 8.2(2) and 8.3(2)GLX, as used in Catalyst switches, allows remote attackers to cause a denial of service (system crash and reload) by sending invalid packets instead of the final ACK portion of the three-way handshake to the (1) Telnet, (2) HTTP, or (3) SSH services, aka "TCP-ACK DoS attack."

    Published:Jun 15, 2004
    Last Modified:Apr 16, 2026
    EPS:Jun 15, 2004
    EPSS Score:0.00642
    CVSS Score:5

    Affected Products

    Vendor
    Cisco
    Product
    Catalyst 2901
    Vendor
    Cisco
    Product
    Catalyst 2902
    Vendor
    Cisco
    Product
    Catalyst 2926
    Vendor
    Cisco
    Product
    Catalyst 2926f
    Vendor
    Cisco
    Product
    Catalyst 2926gl
    Vendor
    Cisco
    Product
    Catalyst 2926gs
    Vendor
    Cisco
    Product
    Catalyst 2926t
    Vendor
    Cisco
    Product
    Catalyst 2948
    Vendor
    Cisco
    Product
    Catalyst 2948-ge-tx
    Vendor
    Cisco
    Product
    Catalyst 2948g-l3
    Vendor
    Cisco
    Product
    Catalyst 2980g
    Vendor
    Cisco
    Product
    Catalyst 2980g-a
    Vendor
    Cisco
    Product
    Catalyst 4000
    Vendor
    Cisco
    Product
    Catalyst 4500
    Vendor
    Cisco
    Product
    Catalyst 4503
    Vendor
    Cisco
    Product
    Catalyst 4506
    Vendor
    Cisco
    Product
    Catalyst 4507r
    Vendor
    Cisco
    Product
    Catalyst 4510r
    Vendor
    Cisco
    Product
    Catalyst 4912g
    Vendor
    Cisco
    Product
    Catalyst 5000
    Vendor
    Cisco
    Product
    Catalyst 6000 Ws-svc-nam-1
    Vendor
    Cisco
    Product
    Catalyst 6000 Ws-svc-nam-2
    Vendor
    Cisco
    Product
    Catalyst 6000 Ws-x6380-nam
    Vendor
    Cisco
    Product
    Catos

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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