CVE WatchAug 11, 2026

CVE-2020-3452

Cisco ASA and FTD Read-Only Path Traversal Vulnerability

CVSS

7.5

High

EPSS

100.0%

p100

KEV

YES

Nov 3, 2021

Exploit Today

0-100

Published: Jul 22, 2020 · Last modified: Aug 11, 2026 · CWE-20 · CWE-22

EPSS · 30d

100.0%EPSS · 30 days100.0%

2026-09-162026-10-14

KEV catalog record

Product

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

Vulnerability

Cisco ASA and FTD Read-Only Path Traversal Vulnerability

Added to KEV

Nov 3, 2021

Remediate by

May 3, 2022

Known ransomware use

Summary description

Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an improper input validation vulnerability when HTTP requests process URLs. 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.

Required action

Apply updates per vendor instructions.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2020-3452

Technical 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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

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