Vulnerabilities
CVE-2020-3580 — Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services Interface Cross-Site Scripting Vulnerabilities
CVE-2020-3580 · Secure Firewall ASA · CVSS 6.1 · KEV
In brief
- Severity · CVSS
- Medium6.1CVSS 3.1, Medium
- EPSS
- 86%
- CISA KEV
- Known exploited, listed since 3 Nov 2021
- CERT-FR
- No advisory or alert referenced in the catalog
- Vendor
- Cisco
- Products
- Secure Firewall ASA
- Published · Modified
- ·
- Last verified
Summary
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.
Weakness: CWE-79
Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.
Affected and fixed versions
Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.
6 branches with a published fixed release · 4 branches to migrate
Cisco Adaptive Security Appliance (ASA) Software
- 9.15End of lifeAffected versions< 9.15.1.15First fixed release9.15.1.15
- 9.14End of lifeAffected versions< 9.14.2.8First fixed release9.14.2.8
- 9.13End of lifeAffected versions< 9.13.1.21First fixed release9.13.1.21
- 9.12End of lifeAffected versions< 9.12.4.13First fixed release9.12.4.13
- 9.10End of lifeAffected versionsAll releases of the branchFirst fixed releaseMigration to a fixed release required
- 9.9End of lifeAffected versions< 9.9.2.85First fixed release9.9.2.85
- 9.8End of lifeAffected versions< 9.8.4.34First fixed release9.8.4.34
- 9.7End of lifeAffected versionsAll releases of the branchFirst fixed releaseMigration to a fixed release required
- before 9.6End of lifeAffected versionsListed as affected, releases not specifiedFirst fixed releaseMigration to a fixed release required
- 9.6End of lifeAffected versionsAll releases of the branchFirst fixed releaseMigration to a fixed release required
Remediation
Fix available
Vendor fix
- Adaptive Security Appliance (ASA) Software 9.159.15.1.15
- Adaptive Security Appliance (ASA) Software 9.149.14.2.8
- Adaptive Security Appliance (ASA) Software 9.139.13.1.21
- Adaptive Security Appliance (ASA) Software 9.129.12.4.13
- Adaptive Security Appliance (ASA) Software 9.99.9.2.85
- Adaptive Security Appliance (ASA) Software 9.89.8.4.34
Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.
Branches without a fix of their own: migrate to a fixed release
- Adaptive Security Appliance (ASA) Software 9.10
- Adaptive Security Appliance (ASA) Software 9.7
- Adaptive Security Appliance (ASA) Software 9.6
- Adaptive Security Appliance (ASA) Software 9.6
Cisco has released updates that fix this vulnerability; its advisory lists them.
SourceCisco Security Advisory cisco-sa-asaftd-xss-multiple-FCB3vPZe
Workarounds (vendor)
Cisco states in its advisory that no workaround is available.
SourceCisco Security Advisory cisco-sa-asaftd-xss-multiple-FCB3vPZe
Last verified 1 Oct 2026 at 09:30 UTC
Known exploitation
Added to CISA KEV on 3 Nov 2021
Federal remediation due date: 3 May 2022
Known use in ransomware campaigns
86% probability of exploitation in the next 30 days (percentile 100%).
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CERT-FR
No CERT-FR advisory or alert of the last two years references this CVE, for the vendors Patcharo covers.
Timeline
- Published by the source
- Added to CISA KEV
- CISA remediation due date
- Source record last modified
- EPSS score computed
- Last verified by Patcharo
Official sources
- Cisco (CVE record)retrieved 1 Oct 2026 at 09:30 UTC
- CISA Known Exploited Vulnerabilitiesretrieved 1 Oct 2026 at 09:28 UTC
- NVDretrieved 27 Sept 2026 at 23:44 UTC
- FIRST EPSSretrieved 29 Sept 2026 at 03:17 UTC
- Cisco Security Advisory cisco-sa-asaftd-xss-multiple-FCB3vPZeretrieved 1 Oct 2026 at 09:30 UTC
Vendor advisory
Cisco · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · Cisco Security Advisory cisco-sa-asaftd-xss-multiple-FCB3vPZe
How Patcharo reads this
Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.
Read the methodologyRead the guide: Cisco Secure Firewall release trains: Threat Defense, Management Center and ASA versions explained
Related vulnerabilities
Other records affecting the same products, newest first.
- CVE-2026-20349Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Remote Access SSL VPN Denial of Service VulnerabilityHighKEV
- CVE-2025-20362Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Missing Authorization VulnerabilityHighKEV
- CVE-2025-20333Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow VulnerabilityCriticalKEV
- CVE-2024-20481Cisco ASA and FTD Denial-of-Service VulnerabilityMediumKEV
- CVE-2024-20359Cisco ASA and FTD Privilege Escalation VulnerabilityMediumKEV
All Secure Firewall ASA vulnerabilitiesAll Cisco vulnerabilities