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    CVE-2006-4650

    Cisco IOS 12.0, 12.1, and 12.2, when GRE IP tunneling is used and the RFC2784 compliance fixes are missing, does not verify the offset field of a GRE packet during decapsulation, which leads to an integer overflow that references data from incorrect memory locations, which allows remote attackers to inject crafted packets into the routing queue, possibly bypassing intended router ACLs.

    Published:Sep 9, 2006
    Last Modified:Apr 16, 2026
    EPS:Sep 9, 2006
    EPSS Score:0.00636
    CVSS Score:2.6

    Affected Products

    Vendor
    Cisco
    Product
    Ios

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    http://secunia.com/advisories/21783
    http://securityreason.com/securityalert/1526
    http://securitytracker.com/id?1016799
    http://www.cisco.com/en/US/tech/tk827/tk369/tsd_technology_security_response09186a008072cd7b.html
    http://www.osvdb.org/28590
    http://www.phenoelit.de/stuff/CiscoGRE.txt
    http://www.securityfocus.com/archive/1/445322/100/0/threaded
    http://www.securityfocus.com/bid/19878
    http://www.vupen.com/english/advisories/2006/3502
    https://exchange.xforce.ibmcloud.com/vulnerabilities/28786
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5713
    http://secunia.com/advisories/21783
    http://securityreason.com/securityalert/1526
    http://securitytracker.com/id?1016799
    http://www.cisco.com/en/US/tech/tk827/tk369/tsd_technology_security_response09186a008072cd7b.html
    http://www.osvdb.org/28590
    http://www.phenoelit.de/stuff/CiscoGRE.txt
    http://www.securityfocus.com/archive/1/445322/100/0/threaded
    http://www.securityfocus.com/bid/19878
    http://www.vupen.com/english/advisories/2006/3502
    https://exchange.xforce.ibmcloud.com/vulnerabilities/28786
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5713

    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