Resource exhaustion in Cisco Asa 5506h-X
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.025 (83.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000
Affected products
- Cisco Asa 5506h-X
- Cisco Asa 5506h-X Firmware — versions 9.6\(4.16\), 9.8(3.8), 9.8\(3.8\)
- Cisco Asa 5506w-X
- Cisco Asa 5506w-X Firmware — versions 9.6\(4.16\), 9.8(3.8), 9.8\(3.8\)
- Cisco Asa 5506-X
- Cisco Asa 5506-X Firmware — versions 9.6\(4.16\), 9.8(3.8), 9.8\(3.8\)
- Cisco Asa 5508-X
- Cisco Asa 5508-X Firmware — versions 9.6\(4.16\), 9.8(3.8), 9.8\(3.8\)
- Cisco Asa 5516-X
- Cisco Asa 5516-X Firmware — versions 9.6\(4.16\), 9.8(3.8), 9.8\(3.8\)
Weakness classification (CWE)
References
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190710… (vendor-advisory, Vendor Advisory)
- www.securityfocus.com/bid/109123 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2019-1873?
- CVE-2019-1873 is a high-severity vulnerability in Cisco Asa 5506h-X, classified under Uncontrolled Resource Consumption. CVSS score: 8.6/10. Published 2019-07-10.
- How severe is CVE-2019-1873?
- High severity. CVSS v3 base score is 8.6 out of 10.