Resource exhaustion in Cisco Adaptive Security Appliance Software
CVE-2018-15399
A vulnerability in the TCP syslog module of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to exhaust the 1550-byte buffers on an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing boundary check in an internal function. An attacker could exploit this vulnerability by establishing a man-in-the-middle position between an affected device and its configured TCP syslog server and then maliciously modifying the TCP header in segments that are sent from the syslog server to the affected device. A successful exploit could allow the attacker to exhaust buffer on the affected device and cause all TCP-based features to stop functioning, resulting in a DoS condition. The affected TCP-based features include AnyConnect SSL VPN, clientless SSL VPN, and management connections such as Secure Shell (SSH), Telnet, and HTTPS.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.018 (78.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- Cisco Adaptive Security Appliance Software — versions 9.8(2), 9.4\(4\), 9.4(4)
- Cisco Adaptive Security Appliance (Asa) Software
- Cisco Firepower Threat Defense — versions 6.2.0
- Cisco Secure Firewall Threat Defense — versions 6.2.0
Weakness classification (CWE)
References
- www.securitytracker.com/id/1041785 (VDB Entry, Third Party Advisory, vdb-entry)
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003… (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2018-15399?
- CVE-2018-15399 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under Uncontrolled Resource Consumption. CVSS score: 6.8/10. Published 2018-10-05.
- How severe is CVE-2018-15399?
- Medium severity. CVSS v3 base score is 6.8 out of 10.