CVE-2020-3259: Cisco ASA and FTD Information Disclosure Vulnerability

Vulnerability summary

CVE-2020-3259 is a high (CVSS 7.5) vulnerability in Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD). It is known to be exploited: CISA lists it, first on 15-02-2024. It has been used in ransomware campaigns. EPSS estimates a 71.79% chance of exploitation in the next 30 days, higher than 99.4% of scored vulnerabilities.

Timeline

1. 06-05-2020
   PublishedVulnerability first disclosed.
2. 15-02-2024
   Added to CISA KEVCisco ASA and FTD Information Disclosure Vulnerability
3. 07-03-2024
   CISA remediation dueApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
4. 12-08-2026
   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 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.

• CWE-200Exposure of Sensitive Information to an Unauthorized ActorThe product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.