CVE-2020-3191
Cisco Secure Firewall Threat Defense
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.
Exploitation status
- A vendor advisory or patch reference has been published.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, no special conditions are needed to exploit it.
- To exploit it, no account is needed.
- Beyond that, no action by a user is required.
Scoring
- CVSS
- 8.6 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H- Weakness
- CWE-20
- Assigned by
- psirt@cisco.com
Dates
- Published
- 2020-05-06
- Last modified
- 2026-08-11
- Sources
- NVD
Affected products
- Cisco Secure Firewall Threat Defense6.2.3 - 6.2.3.16, 6.3.0 - 6.3.0.6, 6.4.0 - 6.4.0.6
- Cisco Asa 5505 Firmware9.4\(1\), 96.4\(0.42\)
- Cisco Asa 5505all versions
- Cisco Asa 5510 Firmware9.4\(1\), 96.4\(0.42\)
- Cisco Asa 5510all versions
- Cisco Asa 5512-X Firmware9.4\(1\), 96.4\(0.42\)
- Cisco Asa 5512-Xall versions
- Cisco Asa 5515-X Firmware9.4\(1\), 96.4\(0.42\)
- Cisco Asa 5515-Xall versions
- Cisco Asa 5520 Firmware9.4\(1\), 96.4\(0.42\)
- Cisco Asa 5520all versions
- Cisco Asa 5525-X Firmware9.4\(1\), 96.4\(0.42\)
As listed in the NVD configuration data. Not a statement about your estate.