Resource exhaustion in Cisco Adaptive Security Appliance (ASA) and Cisco Firewall Threat Defense (FTD) - CVE-2020-3529
Published: October 21, 2020 / Updated: October 22, 2020
Vulnerability identifier: #VU47884
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-3529
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to inefficient direct memory access (DMA) memory management during the negotiation phase of an SSL VPN connection. A remote attacker can send a steady stream of crafted Datagram TLS (DTLS) traffic, trigger resource exhaustion and perform a denial of service (DoS) attack.
Affected software
Cisco Adaptive Security Appliance (ASA)
Cisco Firewall Threat Defense (FTD)
Cisco Firewall Threat Defense (FTD)
How to mitigate CVE-2020-3529
Install updates from vendor's website.
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.6.4.45, 9.8.4.29, 9.9.2.80, 9.10.1.44, 9.12.4.4, 9.13.1.13, 9.14.1.30
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