CRLF injection in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2020-3561
Published: October 21, 2020 / Updated: October 22, 2020
Vulnerability identifier: #VU47886
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-3561
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to inject arbitrary data in server response.
The vulnerability exists due to insufficient validation of attacker-supplied data in the Clientless SSL VPN (WebVPN). A remote attacker can trick a victim to click a specially crafted link and redirect the user to arbitrary websites.
Affected software
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Cisco Firewall Threat Defense (FTD)
How to mitigate CVE-2020-3561
Install updates from vendor's website.
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.6.4.35, 9.8.4.20, 9.9.2.80, 9.10.1.43, 9.12.3.9, 9.13.1.10, 9.14.1.10
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.3.0.6, 6.4.0.10, 6.5.0.5, 6.6.1
Cisco Firewall Threat Defense (FTD) - addressed in versions 6.3.0.6, 6.4.0.10, 6.5.0.5, 6.6.1