CVE-2018-0228: n/a Cisco Adaptive Security Appliance vulnerability…

CVE-2018-0228: A vulnerability in the ingress flow creation functionality of Cisco Adaptive Security Appliance (ASA) could...

A vulnerability in the ingress flow creation functionality of Cisco Adaptive Security Appliance (ASA) could allow an unauthenticated, remote attacker to cause the CPU to increase upwards of 100% utilization, causing a denial of service (DoS) condition on an affected system. The vulnerability is due to incorrect handling of an internal software lock that could prevent other system processes from getting CPU cycles, causing a high CPU condition. An attacker could exploit this vulnerability by sending a steady stream of malicious IP packets that can cause connections to be created on the targeted device. A successful exploit could allow the attacker to exhaust CPU resources, resulting in a DoS condition during which traffic through the device could be delayed. This vulnerability applies to either IPv4 or IPv6 ingress traffic. This vulnerability affects Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) Software that is running on the following Cisco products: 3000 Series Industrial Security Appliances (ISA), ASA 5500 Series Adaptive Security Appliances, ASA 5500-X Series Next-Generation Firewalls, ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Adaptive Security Virtual Appliances (ASAv), Firepower 2100 Series Security Appliances, Firepower 4110 Security Appliances, Firepower 9300 ASA Security Modules. Cisco Bug IDs: CSCvf63718.

UnknownCVSS not scoredNot KEV-listedUpdatedNov 29, 2024, 15:18 UTC (UTC+00:00)

Security readout for executives and security teams

This flaw can let an unauthenticated remote attacker drive affected Cisco ASA or FTD firewalls to near-maximum CPU use, delaying traffic through the device. For an executive, the concern is availability: an exposed security gateway could become a bottleneck or denial-of-service point without attacker credentials. Exposure is most likely where listed Cisco ASA or FTD platforms process untrusted IPv4 or IPv6 ingress traffic, especially internet-facing perimeter firewalls, industrial security appliances, ASAv, and Firepower appliances running affected software. Treat this as a high-priority availability risk for exposed Cisco security gateways. It does not describe data theft or code execution, but firewall DoS can disrupt business connectivity and security enforcement. Confirm exposure and vendor remediation status promptly. Mitigation focus: Review Cisco advisory cisco-sa-20180418-asa2 for affected and fixed software details.; Prioritize perimeter ASA and FTD devices handling untrusted ingress traffic.; Apply Cisco-recommended fixed software or mitigation guidance where applicable..

Prepared: Jun 7, 2026, 13:40 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Apr 19, 2018, 20:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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Source materials

CVE List V5 sourceCVE List V5
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180418-asa2CVE reference · x_refsource_CONFIRM
https://ics-cert.us-cert.gov/advisories/ICSA-18-184-01CVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/aCisco Adaptive Security ApplianceCisco Adaptive Security ApplianceListed

Weakness

CWE details

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Improper Input Validation

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