A vulnerability in the Secure Sockets Layer (SSL) VPN feature of Cisco Adaptive Security Appliance (ASA) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition that prevents the creation of new SSL/Transport Layer Security (TLS) connections to an affected device. The vulnerability is due to incorrect handling of Base64-encoded strings. An attacker could exploit this vulnerability by opening many SSL VPN sessions to an affected device. The attacker would need to have valid user credentials on the affected device to exploit this vulnerability. A successful exploit could allow the attacker to overwrite a special system memory location, which will eventually result in memory allocation errors for new SSL/TLS sessions to the device, preventing successful establishment of these sessions. A reload of the device is required to recover from this condition. Established SSL/TLS connections to the device and SSL/TLS connections through the device are not affected. Note: Although this vulnerability is in the SSL VPN feature, successful exploitation of this vulnerability would affect all new SSL/TLS sessions to the device, including management sessions.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 11 products from cisco, from cisco, from cisco and 8 others, organizations running these solutions should prioritize assessment and patching.
First disclosed in 2019, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.
2019-10-02T19:15:12.327
2024-11-21T04:23:20.353
Modified
CVSSv3.1: 6.5 (MEDIUM)
AV:N/AC:L/Au:S/C:N/I:N/A:P
8.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | cisco | adaptive_security_appliance_software | < 9.3.3.9 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.1.7.4 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.2.4.8 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.4.2.11 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.5.2.5 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.6.2 | Yes |
| Hardware | cisco | asa_5505 | - | No |
| Hardware | cisco | asa_5510 | - | No |
| Hardware | cisco | asa_5512-x | - | No |
| Hardware | cisco | asa_5515-x | - | No |
| Hardware | cisco | asa_5520 | - | No |
| Hardware | cisco | asa_5525-x | - | No |
| Hardware | cisco | asa_5550 | - | No |
| Hardware | cisco | asa_5555-x | - | No |
| Hardware | cisco | asa_5580 | - | No |
| Hardware | cisco | asa_5585-x | - | No |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.