CVE-2023-20241: cisco anyconnect_secure_mobility_client Out-of-bounds Read

Vulnerability summary

CVE-2023-20241 is a medium (CVSS 5.5) Out-of-bounds Read vulnerability in cisco anyconnect_secure_mobility_client. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 8.8% of scored vulnerabilities.

Timeline

1. 22-11-2023
   PublishedVulnerability first disclosed.
2. 05-06-2025
   Last modifiedVulnerability information updated.

Description

Multiple vulnerabilities in Cisco Secure Client Software, formerly AnyConnect Secure Mobility Client, could allow an authenticated, local attacker to cause a denial of service (DoS) condition on an affected system. These vulnerabilities are due to an out-of-bounds memory read from Cisco Secure Client Software. An attacker could exploit these vulnerabilities by logging in to an affected device at the same time that another user is accessing Cisco Secure Client on the same system, and then sending crafted packets to a port on that local host. A successful exploit could allow the attacker to crash the VPN Agent service, causing it to be unavailable to all users of the system. To exploit these vulnerabilities, the attacker must have valid credentials on a multi-user system.

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.