CVE-2018-0296
Published: November 3, 2021
Official Description
Cisco Adaptive Security Appliance (ASA) contains an improper input validation vulnerability with HTTP URLs. Exploitation could allow an attacker to cause a denial-of-service (DoS) condition or information disclosure.
CISA KEV Advisory
Cisco Adaptive Security Appliance (ASA) Denial-of-Service Vulnerability
Cisco Adaptive Security Appliance (ASA) contains an improper input validation vulnerability with HTTP URLs. Exploitation could allow an attacker to cause a denial-of-service (DoS) condition or information disclosure.
Apply updates per vendor instructions.
Risk Analysis
This flaw in Cisco Adaptive Security Appliance (ASA) involves improper input validation for HTTP URLs, which can lead to a denial-of-service condition or information disclosure. The very high EPSS score suggests a strong likelihood of exploitation, and its presence in CISA's KEV confirms active exploitation, making it a critical concern.
This vulnerability is actively exploited in the wild, meaning that functional exploits are circulating and being used by threat actors. This flaw is remotely exploitable.
Apply the security updates provided by Cisco for Adaptive Security Appliance (ASA). Regularly review and harden configurations of Cisco ASA devices to mitigate potential attacks.
Technical Analysis
CVE-2018-0296 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2018-0296 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2018-0296 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1