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CVE-2020-3259

7.5
HIGHCVSS v3.1 Base Score
69.73%
MEDIUM RiskEPSS (99th percentile)
KEV

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.

Published: 5/6/2020
Modified: 10/28/2025
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Cisco ASA and FTD Information Disclosure Vulnerability

Vendor / Product:

Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)

Required Action:

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Due Date: 3/7/2024(OVERDUE)
Ransomware Campaign Use
Added to KEV:

2/15/2024

Notes:

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-info-disclose-9eJtycMB; https://nvd.nist.gov/vuln/detail/CVE-2020-3259

Vulnerability Summary

CVSS v3 Score

7.5HIGH

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

CVSS v2 Score

5

AV:N/AC:L/Au:N/C:P/I:N/A:N

EPSS Score (Exploitation Probability)

69.73%MEDIUM Exploitation Risk
99th percentile

This vulnerability has a 69.73% probability of being exploited in the next 30 days, ranking higher than 99% of all scored CVEs.

CWE Classification

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Similar SeverityHIGH