# CVE-2020-3580: Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability

Source: https://junglewise.ai/threats/cve-2020-3580-cisco-asa-and-ftd-cross-site-scripting-xss-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-11-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2020-3580 · Severity: critical · CVSS 6.1 · Exploited in the wild · Published 2021-11-03

Cisco ASA and FTD Software contain multiple cross-site scripting (XSS) vulnerabilities in their web services interface due to insufficient input validation. An unauthenticated remote attacker can exploit these by persuading a user to click a crafted link, allowing the execution of arbitrary script code or access to sensitive browser information.

Technologies: [Cisco Adaptive Security Appliance (ASA)](https://junglewise.ai/threats/technologies/adaptive-security-appliance-asa), [Cisco Firepower Threat Defense (FTD)](https://junglewise.ai/threats/technologies/firepower-threat-defense-ftd). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2020-3580 exploited in the wild?** Yes. CVE-2020-3580 is known to be exploited in the wild, first recorded on 3 November 2021. Treat it as urgent.

**How severe is CVE-2020-3580?** Critical severity, with a CVSS score of 6.1, published 3 November 2021.

**Which products and versions are affected?** Cisco Adaptive Security Appliance (ASA) Software 9.7 to 9.8.4.34, 9.9 to 9.9.2.85, 9.10 to 9.12.4.13, 9.13 to 9.13.1.21, 9.14 to 9.14.2.8, 9.15 to 9.15.1.15; Cisco Firepower Threat Defense (FTD) Software Up to 6.4.0.12, 6.5.0 to 6.6.4, 6.7.0 to 6.7.0.2.

**Is there a fix for CVE-2020-3580?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2020-3580 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2020-3580?** Check whether you run Cisco Adaptive Security Appliance (ASA) or Cisco Firepower Threat Defense (FTD). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Cisco Adaptive Security Appliance (ASA) Software 9.7 to 9.8.4.34, 9.9 to 9.9.2.85, 9.10 to 9.12.4.13, 9.13 to 9.13.1.21, 9.14 to 9.14.2.8, 9.15 to 9.15.1.15
- Cisco Firepower Threat Defense (FTD) Software Up to 6.4.0.12, 6.5.0 to 6.6.4, 6.7.0 to 6.7.0.2

## Timeline

- 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2021-11-03: disclosed
- 2021-11-03: exploited: Reported as exploited in the wild.

## Related threats

- [Cisco Adaptive Security Appliance (ASA) Cross-Site Scripting (XSS) Vulnerability](https://junglewise.ai/threats/cve-2014-2120-cisco-adaptive-security-appliance-asa-cross-site-scripting-xss)
- [Cisco ASA and FTD Denial-of-Service Vulnerability](https://junglewise.ai/threats/cve-2024-20481-cisco-asa-and-ftd-denial-of-service-vulnerability)
- [Cisco ASA and FTD Denial of Service Vulnerability](https://junglewise.ai/threats/cve-2024-20353-cisco-asa-and-ftd-denial-of-service-vulnerability)
- [Cisco ASA and FTD Privilege Escalation Vulnerability](https://junglewise.ai/threats/cve-2024-20359-cisco-asa-and-ftd-privilege-escalation-vulnerability)
- [SafePay ransomware campaign](https://junglewise.ai/threats/cve-2020-3259-cisco-asa-and-ftd-information-disclosure-vulnerability)