Exploited· due 2022-05-037.5highHigh

CVE-2020-3452

Cisco Adaptive Security Appliance Software

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.

Exploitation status

CISA has confirmed this is being exploited in the wild. That is an observation of real attacks, not a prediction.
US federal civilian agencies are required to remediate it by 2022-05-03. That deadline does not bind private companies, but it is a reasonable benchmark for how urgently CISA views it.
A vendor advisory or patch reference has been published.

Required action

Apply updates per vendor instructions.

CISA’s wording, unedited.

What the metrics mean

It is reachable over a network, without needing local access.
For an attacker who can reach it, no special conditions are needed to exploit it.
To exploit it, no account is needed.
Beyond that, no action by a user is required.

Scoring

CVSS: 7.5 (v3.1)
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-20
Assigned by: psirt@cisco.com

Dates

Published: 2020-07-22
Last modified: 2026-08-11
Added to KEV: 2021-11-03
Remediation due: 2022-05-03
Sources: CISA KEV, NVD

Affected products

Cisco Adaptive Security Appliance Software9.6 - 9.6.4.42, 9.8 - 9.8.4.20, 9.9 - 9.9.2.74, 9.10 - 9.10.1.42, 9.12 - 9.12.3.12, 9.13 - 9.13.1.10, 9.14 - 9.14.1.10
Cisco Asa 5505all versions
Cisco Asa 5510all versions
Cisco Asa 5512-Xall versions
Cisco Asa 5515-Xall versions
Cisco Asa 5520all versions
Cisco Asa 5525-Xall versions
Cisco Asa 5540all versions
Cisco Asa 5545-Xall versions
Cisco Asa 5550all versions
Cisco Asa 5555-Xall versions
Cisco Asa 5580all versions

As listed in the NVD configuration data. Not a statement about your estate.