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    CVE-2020-3562

    A vulnerability in the SSL/TLS inspection of Cisco Firepower Threat Defense (FTD) Software for Cisco Firepower 2100 Series firewalls could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper input validation for certain fields of specific SSL/TLS messages. An attacker could exploit this vulnerability by sending a malformed SSL/TLS message through an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. No manual intervention is needed to recover the device after it has reloaded.

    Published:Oct 21, 2020
    Last Modified:Aug 11, 2026
    EPS:Oct 21, 2020
    EPSS Score:0.0181
    CVSS Score:8.6

    Affected Products

    Vendor
    Cisco
    Product
    Firepower 2110
    Vendor
    Cisco
    Product
    Firepower 2120
    Vendor
    Cisco
    Product
    Firepower 2130
    Vendor
    Cisco
    Product
    Firepower 2140
    Vendor
    Cisco
    Product
    Secure Firewall Threat Defense

    Exploits

    No exploit reference

    Related CVEs

    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