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CVE-2020-3187

CRITICAL

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 conduct directory traversal attacks and obtain read and delete access to sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of the HTTP URL. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences. An exploit could allow the attacker to view or delete arbitrary files on the targeted system. When the device is reloaded after exploitation of this vulnerability, any files that were deleted are restored. The attacker can only view and delete files within the web services file system. This file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability can not be used to obtain access to ASA or FTD system files or underlying operating system (OS) files. Reloading the affected device will restore all files within the web services file system.

Published: May 6, 2020 Modified: Aug 11, 2026
CWE-22 CWE-22

CVSS Metrics

CVSSv3
Attack Vector: NETWORK Attack Complexity: LOW Privileges Required: NONE User Interaction: NONE Scope: UNCHANGED Confidentiality Impact: HIGH Integrity Impact: HIGH Availability Impact: NONE

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

Affected Products (22)

Vendor Product Version
cisco secure_firewall_threat_defense * ≥ 6.2.3 < 6.2.3.16
cisco secure_firewall_threat_defense * ≥ 6.3.0 < 6.3.0.6
cisco secure_firewall_threat_defense * ≥ 6.4.0 < 6.4.0.8
cisco secure_firewall_threat_defense * ≥ 6.5.0 < 6.5.0.4
cisco asa_5505_firmware 9.6\(4\)
cisco asa_5510_firmware 9.6\(4\)
cisco asa_5512-x_firmware 9.6\(4\)
cisco asa_5515-x_firmware 9.6\(4\)
cisco asa_5520_firmware 9.6\(4\)
cisco asa_5525-x_firmware 9.6\(4\)
cisco asa_5540_firmware 9.6\(4\)
cisco asa_5545-x_firmware 9.6\(4\)
cisco asa_5550_firmware 9.6\(4\)
cisco asa_5555-x_firmware 9.6\(4\)
cisco asa_5580_firmware 9.6\(4\)
cisco asa_5585-x_firmware 9.6\(4\)
cisco adaptive_security_appliance_software * ≥ 9.6 < 9.6.4.40
cisco adaptive_security_appliance_software * ≥ 9.8 < 9.8.4.15
cisco adaptive_security_appliance_software * ≥ 9.9 < 9.9.2.66
cisco adaptive_security_appliance_software * ≥ 9.10 < 9.10.1.37

…and 2 more

GitHub Security Advisory GHSA-5f48-6vm9-w28v

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software...

Risk Scores

CVSS Score 9.1 / 10
EPSS Score 96.60%

Top 0% most likely to be exploited

Threat Score 75.4 / 100

Data Sources

NVD EPSS GitHub