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CVE-2019-1873

HIGHCVSS 8.6/10EPSS 2.46%

Last modified

CVE-2019-1873 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. A vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly. The vulnerability is due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. EPSS estimates a 2.46% chance of exploitation in the next 30 days.

Description

A vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly. The vulnerability is due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. An attacker could exploit this vulnerability by sending a crafted TLS/SSL packet to an interface on the targeted device. An exploit could allow the attacker to cause the device to reload, which will result in a denial of service (DoS) condition. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in routed and transparent firewall mode and in single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. A valid SSL or TLS session is required to exploit this vulnerability.

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
2.46%

82.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoAsa 5506-X Firmware9.6\(4.16\)
CiscoAsa 5506-X Firmware9.8\(3.8\)
CiscoAsa 5506h-X Firmware9.6\(4.16\)
CiscoAsa 5506h-X Firmware9.8\(3.8\)
CiscoAsa 5506w-X Firmware9.6\(4.16\)
CiscoAsa 5506w-X Firmware9.8\(3.8\)
CiscoAsa 5508-X Firmware9.6\(4.16\)
CiscoAsa 5508-X Firmware9.8\(3.8\)
CiscoAsa 5516-X Firmware9.6\(4.16\)
CiscoAsa 5516-X Firmware9.8\(3.8\)

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-1873?
A vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly. The vulnerability is due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. An attacker could exploit this vulnerability by sending a crafted TLS/SSL packet to an interface on the targeted device. An exploit could allow the attacker to cause the device to reload, which will result in a denial of service (DoS) condition. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in routed and transparent firewall mode and in single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. A valid SSL or TLS session is required to exploit this vulnerability.
How severe is CVE-2019-1873?
CVE-2019-1873 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 2.46% probability of exploitation in the next 30 days.
How do I fix CVE-2019-1873?
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.

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Source: NVD / NIST