CVE-2021-34783
Description
A vulnerability in the software-based SSL/TLS message handler of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient validation of SSL/TLS messages when the device performs software-based SSL/TLS decryption. An attacker could exploit this vulnerability by sending a crafted SSL/TLS message to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: Datagram TLS (DTLS) messages cannot be used to exploit this vulnerability.
How to fix
- cisco adaptive_security_appliance_software9.8.4.40, 9.12.4.29, 9.14.3.9, 9.15.1.17, 9.16.2 or later
- cisco secure_firewall_threat_defense6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cisco adaptive_security_appliance_software | 9.8.0 ≤ v < 9.8.4.40, 9.12.0 ≤ v < 9.12.4.29, 9.14.0 ≤ v < 9.14.3.9, 9.15.0 ≤ v < 9.15.1.17, 9.16.0 ≤ v < 9.16.2 | 9.8.4.40, 9.12.4.29, 9.14.3.9, 9.15.1.17, 9.16.2 |
| cisco secure_firewall_threat_defense | 6.4.0 ≤ v < 6.4.0.13, 6.6.0 ≤ v < 6.6.5, 6.7.0 ≤ v < 6.7.0.3, 7.0.0 ≤ v < 7.0.1 | 6.4.0.13, 6.6.5, 6.7.0.3, 7.0.1 |
| cisco asa_5512-x_firmware | 009.016\(001\), 009.016\(001.025\) | — |
| cisco asa_5505_firmware | 009.016\(001\), 009.016\(001.025\) | — |
| cisco asa_5515-x_firmware | 009.016\(001\), 009.016\(001.025\) | — |
| cisco asa_5525-x_firmware | 009.016\(001\), 009.016\(001.025\) | — |
| cisco asa_5545-x_firmware | 009.016\(001\), 009.016\(001.025\) | — |
| cisco asa_5555-x_firmware | 009.016\(001\), 009.016\(001.025\) | — |
| cisco asa_5580_firmware | 009.016\(001\), 009.016\(001.025\) | — |
| cisco asa_5585-x_firmware | 009.016\(001\), 009.016\(001.025\) | — |
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