CVE-2020-3578

Name: CVE-2020-3578
Creator: NVD / NIST
Published: 2020-10-21T19:15:18.513+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.22%

Last modified Jun 17, 2026

CVE-2020-3578 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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 bypass a configured access rule and access parts of the WebVPN portal that are supposed to be blocked. The vulnerability is due to insufficient validation of URLs when portal access rules are configured. EPSS estimates a 1.22% chance of exploitation in the next 30 days.

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 bypass a configured access rule and access parts of the WebVPN portal that are supposed to be blocked. The vulnerability is due to insufficient validation of URLs when portal access rules are configured. An attacker could exploit this vulnerability by accessing certain URLs on the affected device.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.22%

64.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Firepower Threat Defense	< 6.3.0.6
Cisco	Firepower Threat Defense	>= 6.4.0, < 6.4.0.10
Cisco	Firepower Threat Defense	>= 6.5.0, < 6.5.0.5
Cisco	Firepower Threat Defense	>= 6.6.0, < 6.6.1
Cisco	Adaptive Security Appliance Software	< 9.6.4.45
Cisco	Adaptive Security Appliance Software	>= 9.7, < 9.8.4.26
Cisco	Adaptive Security Appliance Software	>= 9.9, < 9.9.2.80
Cisco	Adaptive Security Appliance Software	>= 9.10, < 9.10.1.44
Cisco	Adaptive Security Appliance Software	>= 9.12, < 9.12.4.4
Cisco	Adaptive Security Appliance Software	>= 9.13, < 9.13.1.13
Cisco	Adaptive Security Appliance Software	>= 9.14, < 9.14.1.19

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-P73ABNWQPatch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-rule-bypass-P73ABNWQPatch, Vendor Advisory

Timeline

Published: Oct 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-3578?

How severe is CVE-2020-3578?

CVE-2020-3578 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.22% probability of exploitation in the next 30 days.

How do I fix CVE-2020-3578?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-3578?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST