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HIGH · 8.6

CVE-2020-3191

A vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to c...

Vulnerability Description

A vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper length validation of a field in an IPv6 DNS packet. An attacker could exploit this vulnerability by sending a crafted DNS query over IPv6, which traverses the affected device. An exploit could allow the attacker to cause the device to reload, resulting in a DoS condition. This vulnerability is specific to DNS over IPv6 traffic only.

CVSS Score

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
CiscoFirepower Threat Defense>= 6.2.3, < 6.2.3.16
CiscoAsa 5505 Firmware9.4\(1\)
CiscoAsa 5505-
CiscoAsa 5510 Firmware9.4\(1\)
CiscoAsa 5510-
CiscoAsa 5512-X Firmware9.4\(1\)
CiscoAsa 5512-X-
CiscoAsa 5515-X Firmware9.4\(1\)
CiscoAsa 5515-X-
CiscoAsa 5520 Firmware9.4\(1\)
CiscoAsa 5520-
CiscoAsa 5525-X Firmware9.4\(1\)
CiscoAsa 5525-X-
CiscoAsa 5540 Firmware9.4\(1\)
CiscoAsa 5540-
CiscoAsa 5545-X Firmware9.4\(1\)
CiscoAsa 5545-X-
CiscoAsa 5550 Firmware9.4\(1\)
CiscoAsa 5550-
CiscoAsa 5555-X Firmware9.4\(1\)

Related Weaknesses (CWE)

CWE-20

References

FAQ

What is CVE-2020-3191?

CVE-2020-3191 is a vulnerability with a CVSS score of 8.6 (HIGH). A vulnerability in DNS over IPv6 packet processing for Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to c...

How severe is CVE-2020-3191?

CVE-2020-3191 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2020-3191?

Check the references section above for vendor advisories and patch information. Affected products include: Cisco Firepower Threat Defense, Cisco Asa 5505 Firmware, Cisco Asa 5505, Cisco Asa 5510 Firmware, Cisco Asa 5510.