Horizon Alert
Summary of the vulnerability and why it matters
The Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) software contain a flaw in how they handle web interface requests. This weakness could allow an attacker to disrupt services or access sensitive system details. The vulnerability is related to improper validation of HTTP URLs, which can be exploited by sending specially crafted requests.
- Vulnerable Cisco ASA and FTD software
- Improper HTTP URL input validation
- Denial of service or information disclosure
Attack Path
How an attacker could exploit the issue
This vulnerability allows an unauthenticated, remote attacker to impact network devices. Attackers can exploit this by sending a specially crafted HTTP request to an affected device. Successful exploitation can lead to a denial-of-service condition, causing devices to unexpectedly reload. In some instances, an attacker may also gain access to sensitive system information through directory traversal techniques.
- Exposed web interface.
- Attacker sends crafted request.
- Device reloads or reveals data.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability in Cisco Adaptive Security Appliances and Firepower Threat Defense devices could permit an unauthenticated attacker to disrupt services or access sensitive information. Attackers can exploit this by sending specially crafted HTTP requests. The potential for widespread impact makes this a significant business risk.
- Likely attacker skill level: Low
- Required access or conditions: Network access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability impacts Cisco Adaptive Security Appliance and Firepower Threat Defense software, potentially allowing unauthorized attackers to cause denial-of-service conditions or disclose sensitive system information. The exposure of these devices as internet-facing gateways increases the risk of exploitation. Organizations should prioritize immediate actions to identify and mitigate the impact of this vulnerability.
- Find affected Cisco devices.
- Reduce exposure or isolate risk.
- Fix, verify, and monitor.
