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CVE-2020-3452

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Read-Only Path Traversal Vulnerability

  • High 7.5
  • Exploited: added to CISA KEV 3 Nov 2021

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.

Key facts

Published
22 Jul 2020
Last changed
21 Oct 2025
Assigned by
cisco
KEV added
3 Nov 2021
KEV fix due
3 May 2022
EPSS
99.992% likely to be exploited in the next 30 days, higher than 99.986% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 7.5CVSS 3.1, Highfrom the CNA (cisco)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

What to do

  • Apply updates per vendor instructions.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
CiscoCisco Adaptive Security Appliance (ASA) Software
  • unspecified up to but excluding 9.6.4.42 (affected)
  • unspecified up to but excluding 9.8.4.20 (affected)
  • unspecified up to but excluding 9.9.2.74 (affected)
  • unspecified up to but excluding 9.10.1.42 (affected)
  • unspecified up to but excluding 9.13.1.10 (affected)
  • unspecified up to but excluding 9.14.1.10 (affected)

Timeline

  1. 22 Jul 2020 Published
  2. 3 Nov 2021 CVE-2020-3452 added to CISA KEV
  3. 3 Nov 2021 Added to the CISA KEV catalogue

Weakness

References