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    CVE-2020-3179

    A vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a memory handling error when GRE over IPv6 traffic is processed. An attacker could exploit this vulnerability by sending crafted GRE over IPv6 packets with either IPv4 or IPv6 payload through an affected device. A successful exploit could allow the attacker to cause the device to crash, resulting in a DoS condition.

    Published:May 6, 2020
    Last Modified:Aug 11, 2026
    EPS:May 6, 2020
    EPSS Score:0.01935
    CVSS Score:7.5

    Affected Products

    Vendor
    Cisco
    Product
    Asa 5505
    Vendor
    Cisco
    Product
    Asa 5505 Firmware
    Vendor
    Cisco
    Product
    Asa 5510
    Vendor
    Cisco
    Product
    Asa 5510 Firmware
    Vendor
    Cisco
    Product
    Asa 5512-x
    Vendor
    Cisco
    Product
    Asa 5512-x Firmware
    Vendor
    Cisco
    Product
    Asa 5515-x
    Vendor
    Cisco
    Product
    Asa 5515-x Firmware
    Vendor
    Cisco
    Product
    Asa 5520
    Vendor
    Cisco
    Product
    Asa 5520 Firmware
    Vendor
    Cisco
    Product
    Asa 5525-x
    Vendor
    Cisco
    Product
    Asa 5525-x Firmware
    Vendor
    Cisco
    Product
    Asa 5540
    Vendor
    Cisco
    Product
    Asa 5540 Firmware
    Vendor
    Cisco
    Product
    Asa 5545-x
    Vendor
    Cisco
    Product
    Asa 5545-x Firmware
    Vendor
    Cisco
    Product
    Asa 5550
    Vendor
    Cisco
    Product
    Asa 5550 Firmware
    Vendor
    Cisco
    Product
    Asa 5555-x
    Vendor
    Cisco
    Product
    Asa 5555-x Firmware
    Vendor
    Cisco
    Product
    Asa 5580
    Vendor
    Cisco
    Product
    Asa 5580 Firmware
    Vendor
    Cisco
    Product
    Asa 5585-x
    Vendor
    Cisco
    Product
    Asa 5585-x Firmware
    Vendor
    Cisco
    Product
    Secure Firewall Threat Defense

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-415 Double 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