CVE-2020-3580

Name: CVE-2020-3580
Creator: NVD / NIST
Published: 2020-10-21T19:15:18.607+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10Actively ExploitedEPSS 85.44%

Last modified Jun 17, 2026

CVE-2020-3580 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Multiple vulnerabilities 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 cross-site scripting (XSS) attacks against a user of the web services interface of an affected device. The vulnerabilities are due to insufficient validation of user-supplied input by the web services interface of an affected device. CISA has confirmed active exploitation in the wild. EPSS estimates a 85.44% chance of exploitation in the next 30 days.

Description

Multiple vulnerabilities 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 cross-site scripting (XSS) attacks against a user of the web services interface of an affected device. The vulnerabilities are due to insufficient validation of user-supplied input by the web services interface of an affected device. An attacker could exploit these vulnerabilities by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive, browser-based information. Note: These vulnerabilities affect only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

85.44%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by May 3, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Firepower Threat Defense	< 6.4.0.12
Cisco	Firepower Threat Defense	>= 6.5.0, < 6.6.4
Cisco	Firepower Threat Defense	>= 6.7.0, < 6.7.0.2
Cisco	Adaptive Security Appliance Software	< 9.8.4.34
Cisco	Adaptive Security Appliance Software	>= 9.9, < 9.9.2.85
Cisco	Adaptive Security Appliance Software	>= 9.10, < 9.12.4.13
Cisco	Adaptive Security Appliance Software	>= 9.13, < 9.13.1.21
Cisco	Adaptive Security Appliance Software	>= 9.14, < 9.14.2.8
Cisco	Adaptive Security Appliance Software	>= 9.15, < 9.15.1.15

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-multiple-FCB3vPZePatch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-multiple-FCB3vPZePatch, Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3580US Government Resource

Timeline

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

Frequently Asked Questions

What is CVE-2020-3580?

How severe is CVE-2020-3580?

CVE-2020-3580 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 85.44% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2020-3580?

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-2020-3580?

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

Scan your code now

Source: NVD / NIST