CVE-2020-3259Used in ransomware
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
Cisco ASA and FTD Information Disclosure Vulnerability
What it is
Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an information disclosure vulnerability. An attacker could retrieve memory contents on an affected device, which could lead to the disclosure of confidential information due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. This vulnerability affects only specific AnyConnect and WebVPN configurations.
What to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclos
- nvd.nist.gov/vuln/detail/CVE-2020-3259
Description and required action as published by CISA. Full record at NVD.
Other Cisco entries on the list
- BroadWorks Cisco BroadWorks Improper Restriction of XML External Entity Reference Vulnerability CVE-2026-20320 · Nov 10, 2026
- Secure Firewall ASA Software and Cisco Secure FTD Software Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference Vulnerability CVE-2026-76418 · Oct 29, 2026
- Secure Email Gateway Cisco Secure Email Gateway Relative Path Traversal Vulnerability CVE-2026-76519 · Oct 14, 2026
- Catalyst SD-WAN Manager Cisco Catalyst SD-WAN Manager Hex Encoding Vulnerability CVE-2026-76504 · Sep 30, 2026
- Identity Services Engine Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability CVE-2026-76460 · Sep 16, 2026
- Secure Email Gateway Cisco Secure Email Gateway SQL Injection Vulnerability CVE-2026-76461 · Sep 14, 2026