Buffer overflow in Cisco Systems, Inc products - CVE-2021-1402

Vulnerability identifier: #VU52742

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-2021-1402

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the software-based SSL/TLS message handler. A remote attacker can send a specially crafted SSL/TLS message, trigger memory corruption and cause a denial of service condition on the target system.

Cisco Firewall Threat Defense (FTD)
3000 Series Industrial Security Appliance (ISA)
Cisco Firepower Threat Defense Virtual (FTDv)
ASA 5512-X Adaptive Security Appliance
ASA 5515-X Adaptive Security Appliance
ASA 5525-X Adaptive Security Appliance
ASA 5545-X Adaptive Security Appliance
ASA 5555-X Adaptive Security Appliance
Firepower 1000 Series Appliances

Install updates from vendor's website.

Cisco Firewall Threat Defense (FTD) - addressed in versions 6.4.0, 6.4.0.12, 6.5.0, 6.6.0, 6.6.4, 6.7.0, 6.7.0.2

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-ssl-decrypt-dos-DdyLuK6c

• Denial of service in Cisco Firepower Threat Defense Software