Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting Vulnerabilities (CVE-2020-3580) | HOL Guard CVE

High · CVSS 6.1Known ExploitedCVE-2020-3580

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting Vulnerabilities

Answer in brief

CVE-2020-3580 records a High severity (CVSS 6.1) vulnerability in Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting Vulnerabilities. The current sources mark it as known exploited. The current feed maps Cisco/Cisco Adaptive Security Appliance (ASA) Software (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 21, 2020Updated Aug 11, 2026Source checked Sep 19, 2026First seen by HOL May 24, 2026Material review Aug 11, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 6.1
Exploitation: Known exploited
Affected software: 3 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.1. Known-exploitation status makes exposure review time-sensitive. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Cisco/Cisco Adaptive Security Appliance (ASA) Software (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:cisco:secure_firewall_threat_defense::::::::	Not reported	Not reported
cpe:2.3:o:cisco:adaptive_security_appliance_software::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Cisco/Cisco Adaptive Security Appliance (ASA) Softwaregeneric	n/a	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Cisco/Cisco Adaptive Security Appliance (ASA) Software.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Oct 21, 2020
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
May 24, 2026
Added to CISA KEV
Nov 3, 2021
Evidence: source:kev:kev:kev:record

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.