Cisco ASA/FTD WebVPN/AnyConnect Improper Input Validation (CVE-2020-3452)

high Tenable OT Security Plugin ID 505544

Synopsis

The remote OT asset is affected by a vulnerability.

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 conduct directory traversal attacks and read sensitive files on a targeted system. The vulnerability is due to a lack of proper input validation of URLs in HTTP requests processed by an affected device.
An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device. The web services file system is enabled when the affected device is configured with either WebVPN or AnyConnect features. This vulnerability cannot be used to obtain access to ASA or FTD system files or underlying operating system (OS) files.

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Solution

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 505544

File Name: tenable_ot_cisco_CVE-2020-3452.nasl

Version: 1.3

Type: Remote

Family: Tenable.ot

Published: 7/20/2026

Updated: 7/21/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 6

Percentile: 96.76

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2020-3452

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:adaptive_security_appliance_software, cpe:/o:cisco:firepower_threat_defense

Required KB Items: Tenable.ot/Cisco

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/22/2020

Vulnerability Publication Date: 7/22/2020

CISA Known Exploited Vulnerability Due Dates: 5/3/2022

Reference Information

CVE: CVE-2020-3452

CWE: 20

Detections

Analytics