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    CVE-2023-20027

    A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper reassembly of large packets that occurs when VFR is enabled on either a tunnel interface or on a physical interface that is configured with a maximum transmission unit (MTU) greater than 4,615 bytes. An attacker could exploit this vulnerability by sending fragmented packets through a VFR-enabled interface on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

    Published:Mar 23, 2023
    Last Modified:Nov 21, 2024
    EPS:Mar 23, 2023
    EPSS Score:0.00685
    CVSS Score:8.6

    Affected Products

    Vendor
    Cisco
    Product
    1000 Integrated Services Router
    Vendor
    Cisco
    Product
    1100-4g\/6g Integrated Services Router
    Vendor
    Cisco
    Product
    1100-4g Integrated Services Router
    Vendor
    Cisco
    Product
    1100-4p Integrated Services Router
    Vendor
    Cisco
    Product
    1100-6g Integrated Services Router
    Vendor
    Cisco
    Product
    1100-8p Integrated Services Router
    Vendor
    Cisco
    Product
    1100 Integrated Services Router
    Vendor
    Cisco
    Product
    1101-4p Integrated Services Router
    Vendor
    Cisco
    Product
    1101 Integrated Services Router
    Vendor
    Cisco
    Product
    1109-2p Integrated Services Router
    Vendor
    Cisco
    Product
    1109-4p Integrated Services Router
    Vendor
    Cisco
    Product
    1109 Integrated Services Router
    Vendor
    Cisco
    Product
    1111x-8p Integrated Services Router
    Vendor
    Cisco
    Product
    1111x Integrated Services Router
    Vendor
    Cisco
    Product
    111x Integrated Services Router
    Vendor
    Cisco
    Product
    1120 Integrated Services Router
    Vendor
    Cisco
    Product
    1131 Integrated Services Router
    Vendor
    Cisco
    Product
    1160 Integrated Services Router
    Vendor
    Cisco
    Product
    4221 Integrated Services Router
    Vendor
    Cisco
    Product
    4321 Integrated Services Router
    Vendor
    Cisco
    Product
    4331 Integrated Services Router
    Vendor
    Cisco
    Product
    4351 Integrated Services Router
    Vendor
    Cisco
    Product
    4431 Integrated Services Router
    Vendor
    Cisco
    Product
    4451-x Integrated Services Router
    Vendor
    Cisco
    Product
    4461 Integrated Services Router
    Vendor
    Cisco
    Product
    C8200-1n-4t
    Vendor
    Cisco
    Product
    C8200l-1n-4t
    Vendor
    Cisco
    Product
    C8500l-8s4x
    Vendor
    Cisco
    Product
    Catalyst 8000v Edge
    Vendor
    Cisco
    Product
    Catalyst 8300-1n1s-4t2x
    Vendor
    Cisco
    Product
    Catalyst 8300-1n1s-6t
    Vendor
    Cisco
    Product
    Catalyst 8300-2n2s-4t2x
    Vendor
    Cisco
    Product
    Catalyst 8300-2n2s-6t
    Vendor
    Cisco
    Product
    Cloud Services Router 1000v
    Vendor
    Cisco
    Product
    Ios Xe

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    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