CVE-2021-34704: cisco adaptive_security_appliance_software Stack-based Buffer Overflow

Vulnerability summary

CVE-2021-34704 is a high (CVSS 8.6) Stack-based Buffer Overflow vulnerability in cisco adaptive_security_appliance_software. EPSS estimates a 1.32% chance of exploitation in the next 30 days, higher than 70.3% of scored vulnerabilities.

Timeline

1. 11-01-2022
   PublishedVulnerability first disclosed.
2. 06-11-2024
   Last modifiedVulnerability information updated.

Description

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper input validation when parsing HTTPS requests. An attacker could exploit this vulnerability by sending a malicious HTTPS request to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.