Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-3580

CVE-2020-3580MEDIUM

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  L  N    6.1   .8558   99.7   YES

AFFECTED
  Product                                           Versions  Fixed
  Cisco Adaptive Security Appliance (ASA) Software  n/a –     —

TIMELINE
  Dec 12  Reserved by cisco
  Oct 21  Published (CNA: cisco)
  Nov 3   Added to CISA KEV, remediation due 2022-05-03
  Aug 11  ENRICHED — CVE-2020-3580 (Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)). Received CVSS 6.1 and CPE data from NVD.

CWE-79 · CNA: cisco · CVSS v3.1 · 2 references · NVD status: Analyzed · KEV due May 3, 2022

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
December 12, 2019	Reserved	Reserved by cisco
October 21, 2020	Published	Published (CNA: cisco)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2022-05-03
August 11, 2026	ENRICHED	ENRICHED — CVE-2020-3580 (Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)). Received CVSS 6.1 and CPE data from NVD.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Cisco	Cisco Adaptive Security Appliance (ASA) Software	—	n/a	—

Weaknesses

CWE-79

References (2)

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-multiple-FCB3vPZe [vendor-advisory, x_refsource_CISCO]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3580 [government-resource]

Authoritative record: CVE-2020-3580 at cve.org

Vendors: cisco

Weaknesses: CWE-79

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-3580 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.