February 15, 2024 · Applied Cybernetics Group
CVE-2020-3259 — Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
known ransomware use
Cisco ASA and FTD Information Disclosure Vulnerability
- Added to KEV
2024-02-15- Federal due date
2024-03-07- Vendor
- Cisco
- Product
- Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
- EPSS
- 98.7th percentile (score 0.697, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2020-3259
CISA short description
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.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.