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High severity7.5NVD Advisory· Published May 6, 2020· Updated Aug 11, 2026

CVE-2020-3179

CVE-2020-3179

Description

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

28
  • Cisco Systems, Inc./Secure Firewall Threat Defense
    cpe:2.3:a:cisco:secure_firewall_threat_defense:*:*:*:*:*:*:*:*
    Range: >=6.3.0,<6.3.0.5
  • Cisco Systems, Inc./Asa 5505 Firmware2 versions
    cpe:2.3:o:cisco:asa_5505_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5505_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5505_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5510 Firmware2 versions
    cpe:2.3:o:cisco:asa_5510_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5510_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5510_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5512 X Firmware2 versions
    cpe:2.3:o:cisco:asa_5512-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5512-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5512-x_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5515 X Firmware2 versions
    cpe:2.3:o:cisco:asa_5515-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5515-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5515-x_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5520 Firmware2 versions
    cpe:2.3:o:cisco:asa_5520_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5520_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5520_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5525 X Firmware2 versions
    cpe:2.3:o:cisco:asa_5525-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5525-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5525-x_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5540 Firmware2 versions
    cpe:2.3:o:cisco:asa_5540_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5540_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5540_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5545 X Firmware2 versions
    cpe:2.3:o:cisco:asa_5545-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5545-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5545-x_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5550 Firmware2 versions
    cpe:2.3:o:cisco:asa_5550_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5550_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5550_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5555 X Firmware2 versions
    cpe:2.3:o:cisco:asa_5555-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5555-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5555-x_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5580 Firmware2 versions
    cpe:2.3:o:cisco:asa_5580_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5580_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5580_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./Asa 5585 X Firmware2 versions
    cpe:2.3:o:cisco:asa_5585-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:cisco:asa_5585-x_firmware:101.5\(1.26\):*:*:*:*:*:*:*
    • cpe:2.3:o:cisco:asa_5585-x_firmware:9.9\(2\):*:*:*:*:*:*:*
  • Cisco Systems, Inc./FTDllm-fuzzy
  • Cisco Systems, Inc./Firepower Threat Defense Softwarellm-fuzzy2 versions
    (expand)+ 1 more
    • (no CPE)
    • (no CPE)range: n/a

Patches

Vulnerability mechanics

References

1

News mentions

0

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