CVE-2020-3529: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software SSL VPN Direct Memory Access Denial of Service Vulnerability
First published: Wed Oct 21 2020(Updated: )
A vulnerability in the SSL VPN negotiation process for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to inefficient direct memory access (DMA) memory management during the negotiation phase of an SSL VPN connection. An attacker could exploit this vulnerability by sending a steady stream of crafted Datagram TLS (DTLS) traffic to an affected device. A successful exploit could allow the attacker to exhaust DMA memory on the device and cause a DoS condition.
Credit: ykramarz@cisco.com ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Adaptive Security Appliance | <9.6.4.45 | |
| Cisco Firepower Threat Defense | <6.3.0.6 | |
| Cisco Firepower Threat Defense | >=6.4.0<6.4.0.10 | |
| Cisco Firepower Threat Defense | >=6.5.0<6.5.0.5 | |
| Cisco Firepower Threat Defense | >=6.6.0<6.6.1 | |
| Cisco Adaptive Security Appliance Software | >=9.8.0<9.8.4.29 | |
| Cisco Adaptive Security Appliance Software | >=9.9.0<9.9.2.80 | |
| Cisco Adaptive Security Appliance Software | >=9.10.0<9.10.1.44 | |
| Cisco Adaptive Security Appliance Software | >=9.12.0<9.12.4.4 | |
| Cisco Adaptive Security Appliance Software | >=9.13.0<9.13.1.13 | |
| Cisco Adaptive Security Appliance Software | >=9.14.0<9.14.1.30 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this vulnerability?
The vulnerability ID of this vulnerability is CVE-2020-3529.
What is the affected software?
The affected software includes Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software.
What is the severity of CVE-2020-3529?
The severity of CVE-2020-3529 is high with a score of 7.5.
How can an attacker exploit this vulnerability?
An attacker can exploit this vulnerability by triggering a reload of an affected device through the SSL VPN negotiation process, causing a denial of service (DoS) condition.
How can I fix CVE-2020-3529?
To fix CVE-2020-3529, it is recommended to upgrade to a fixed software version provided by Cisco as described in their advisory.
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- vendor/cisco
- canonical/cisco adaptive security appliance
- canonical/cisco firepower threat defense
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- version/cisco firepower threat defense/6.5.0
- version/cisco firepower threat defense/6.6.0
- canonical/cisco adaptive security appliance software
- version/cisco adaptive security appliance software/9.8.0
- version/cisco adaptive security appliance software/9.9.0
- version/cisco adaptive security appliance software/9.10.0
- version/cisco adaptive security appliance software/9.12.0
- version/cisco adaptive security appliance software/9.13.0
- version/cisco adaptive security appliance software/9.14.0