CVE-2020-3259

CVE-2020-3259 is a high-severity (CVSS 7.5) vulnerability in Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD). CISA added it to the Known Exploited Vulnerabilities catalog on February 15, 2024, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 7, 2024. CISA also lists it as known to be used in ransomware campaigns, so it should be prioritised accordingly. Cisco has 102 vulnerabilities in the KEV catalog, 7 of them linked to ransomware.

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 retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3259