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CVE-2020-3191

HIGHCVSS 8.6/10EPSS 1.82%

Last modified

CVE-2020-3191 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. 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. EPSS estimates a 1.82% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
8.6/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS Probability
1.82%

76.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoFirepower Threat Defense>= 6.2.3, < 6.2.3.16
CiscoFirepower Threat Defense>= 6.3.0, < 6.3.0.6
CiscoFirepower Threat Defense>= 6.4.0, < 6.4.0.6
CiscoAsa 5505 Firmware9.4\(1\)
CiscoAsa 5505 Firmware96.4\(0.42\)
CiscoAsa 5510 Firmware9.4\(1\)
CiscoAsa 5510 Firmware96.4\(0.42\)
CiscoAsa 5512-X Firmware9.4\(1\)
CiscoAsa 5512-X Firmware96.4\(0.42\)
CiscoAsa 5515-X Firmware9.4\(1\)
CiscoAsa 5515-X Firmware96.4\(0.42\)
CiscoAsa 5520 Firmware9.4\(1\)
CiscoAsa 5520 Firmware96.4\(0.42\)
CiscoAsa 5525-X Firmware9.4\(1\)
CiscoAsa 5525-X Firmware96.4\(0.42\)
CiscoAsa 5540 Firmware9.4\(1\)
CiscoAsa 5540 Firmware96.4\(0.42\)
CiscoAsa 5545-X Firmware9.4\(1\)
CiscoAsa 5545-X Firmware96.4\(0.42\)
CiscoAsa 5550 Firmware9.4\(1\)
CiscoAsa 5550 Firmware96.4\(0.42\)
CiscoAsa 5555-X Firmware9.4\(1\)
CiscoAsa 5555-X Firmware96.4\(0.42\)
CiscoAsa 5580 Firmware9.4\(1\)
CiscoAsa 5580 Firmware96.4\(0.42\)
CiscoAsa 5585-X Firmware9.4\(1\)
CiscoAsa 5585-X Firmware96.4\(0.42\)
CiscoAdaptive Security Appliance Software>= 9.6, < 9.6.4.36
CiscoAdaptive Security Appliance Software>= 9.8, < 9.8.4.12
CiscoAdaptive Security Appliance Software>= 9.9, < 9.9.2.66
CiscoAdaptive Security Appliance Software>= 9.10, < 9.10.1.37
CiscoAdaptive Security Appliance Software>= 9.12, < 9.12.2.9

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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 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.
How severe is CVE-2020-3191?
CVE-2020-3191 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 1.82% probability of exploitation in the next 30 days.
How do I fix CVE-2020-3191?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-3191?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST