CVE-2020-3191
high-risk
Published 2020-05-06
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.
Do I need to act?
~
1.0% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.6/10
High
NETWORK
/ LOW complexity
Affected Products (20)
Asa 5510 Firmware
Asa 5510 Firmware
Asa 5520 Firmware
Asa 5520 Firmware
Asa 5540 Firmware
Asa 5540 Firmware
Asa 5550 Firmware
Asa 5550 Firmware
Affected Vendors
References (2)
53
/ 100
high-risk
Severity
29/34 · Critical
Exploitability
3/34 · Minimal
Exposure
21/34 · High