CVE-2020-3580

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.

In the wild

CISA lists this as exploited in real attacks. Treat as urgent.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2019-12-12 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2020-10-21 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2021-11-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
4. 2022-05-03 Remediation deadlineCISA's due date for federal agencies to fix it
5. 2026-08-11 19:42 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
• Exploit odds: 85.6% in the next 30 days (EPSS).
• Severity: 6.1 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-10-21 19:15 UTC

Last modified

2026-08-11 19:42 UTC

Added to CISA KEV

2021-11-03

Exploit probability

85.6% · EPSS, next 30 days

Weakness

CWE-79 · Cross-site scripting

Record status

Analyzed

Affected

• Cisco Secure Firewall Threat Defense < 6.4.0.12
• Cisco Secure Firewall Threat Defense < 6.6.4
• Cisco Secure Firewall Threat Defense < 6.7.0.2
• Cisco Adaptive Security Appliance Software < 9.8.4.34
• Cisco Adaptive Security Appliance Software < 9.9.2.85
• Cisco Adaptive Security Appliance Software < 9.12.4.13
• Cisco Adaptive Security Appliance Software < 9.13.1.21
• Cisco Adaptive Security Appliance Software < 9.14.2.8

Attack profile CVSS 3.1 · 6.1

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-3580.md and follow it. Check whether this project is affected by CVE-2020-3580. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

Copy as ticket · More options · Status badge