This week, Cisco released its April 2022 bundle of security advisories for Cisco Adaptive Security Appliance (ASA), Firepower Threat Defense (FTD), and Firepower Management Center (FMC). 

The semiannual bundled advisories include a total of 19 flaws in Cisco security products, with 11 of them being classified as "high severity." 

CVE-2022-20746 (CVSS score of 8.8) is the most serious of these, an FTD security vulnerability that occurs because TCP flows aren't appropriately handled and might be exploited remotely without authentication to generate a denial of service (DoS) condition. 

“An attacker could exploit this vulnerability by sending a crafted stream of TCP traffic through an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition,” Cisco explains in an advisory. 

With the introduction of FDT versions 6.6.5.2 and 7.1.0.1, the IT giant has addressed the problem. Fixes will also be included in FDT releases 6.4.0.15 and 7.0.2, which will be released next month. Several more DoS vulnerabilities, all rated "high severity," were fixed with the same FDT releases, including ones that affect ASA as well. They were addressed in ASA releases 9.12.4.38, 9.14.4, 9.15.1.21, 9.16.2.14, and 9.17.1.7. Other problems fixed by these software upgrades could result in privilege escalation or data manipulation when using an IPsec IKEv2 VPN channel.

Cisco also fixed an ASA-specific flaw that allowed an attacker to access sensitive information from process memory. Firepower Management Center (FMC) releases 6.6.5.2 and 7.1.0.1, as well as the future releases 6.4.0.15 and 7.0.2, resolve a remotely exploitable security protection bypass flaw, as per the tech giant. 

Cisco stated, “An attacker could exploit this vulnerability by uploading a maliciously crafted file to a device running affected software. A successful exploit could allow the attacker to store malicious files on the device, which they could access later to conduct additional attacks, including executing arbitrary code on the affected device with root privileges."

Fixes for eight medium-severity vulnerabilities in these security products are included in the company's semiannual bundled publishing of security advisories. Cisco is not aware of any attacks that take advantage of these flaws.