CVE-2020-3561
4.7 · MEDIUMOverview
CVE-2020-3561 is a medium-severity vulnerability affecting cisco adaptive_security_appliance. It was published on October 21, 2020 and has a CVSS 3.1 base score of 4.7 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The vulnerability is due to improper input sanitization. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to conduct a CRLF injection attack, adding arbitrary HTTP headers in the responses of the system and redirecting the user to arbitrary websites.
Remediation
Check the references section for vendor advisories and patches from cisco. Update adaptive_security_appliance to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| cisco | adaptive_security_appliance | >= 0, < 9.6.4.35 | Affected |
| cisco | secure_firewall_threat_defense | >= 0, < 6.3.0.6 | Affected |
| cisco | adaptive_security_appliance_software | >= 9.8.0, < 9.8.4.20 | Affected |
Frequently Asked Questions
What is CVE-2020-3561?
CVE-2020-3561 is a medium-severity vulnerability affecting cisco adaptive_security_appliance. It was published on October 21, 2020 and has a CVSS 3.1 base score of 4.7 (MEDIUM).
How severe is CVE-2020-3561?
This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2020-3561?
Check the references section for vendor advisories and patches from cisco. Update adaptive_security_appliance to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2020-3561?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-3561 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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