Secure Firewall Threat DefenseApplication · Cisco
CVE-2020-3580
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedMultiple 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceMultiple cross-site scripting (XSS) vulnerabilities in the web services interface of Cisco ASA and FTD allow unauthenticated remote attackers to inject malicious scripts via insufficiently validated user input. Exploitation requires tricking a user into clicking a crafted link, enabling arbitrary script execution in the browser context or access to sensitive browser-based information. Only specific AnyConnect and WebVPN configurations are affected.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
Secure Firewall Threat DefenseApplication
< 6.4.0.12>= 6.5.0, < 6.6.4>= 6.7.0, < 6.7.0.2
Adaptive Security Appliance SoftwareOperating system
< 9.8.4.34>= 9.9, < 9.9.2.85>= 9.10, < 9.12.4.13>= 9.13, < 9.13.1.21>= 9.14, < 9.14.2.8>= 9.15, < 9.15.1.15CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Cisco ASA or FTD product and versionLog in to the device CLI and run 'show version' to display the installed software version and model informationAffected if The displayed version falls within any of the affected ranges: for FTD: < 6.4.0.12, >= 6.5.0 < 6.6.4, >= 6.7.0 < 6.7.0.2; for ASA: < 9.8.4.34, >= 9.9 < 9.9.2.85, >= 9.10 < 9.12.4.13, >= 9.13 < 9.13.1.21, >= 9.14 < 9.14.2.8, >= 9.15 < 9.15.1.15
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Check if WebVPN is enabledRun 'show run webvpn' or 'show webvpn' to see if WebVPN configuration exists and is activeAffected if WebVPN is configured and enabled on the device
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Check if AnyConnect is enabledRun 'show run anyconnect' or 'show vpn-sessiondb anyconnect' to see if AnyConnect VPN features are configuredAffected if AnyConnect is enabled and accepting connections
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Verify web services interface accessibilityConfirm the device management or web services interface is reachable from the network using a browser or curl to the device IPAffected if The web interface (typically ports 443, 8443) is exposed to untrusted networks
The environment is affected if the device runs a vulnerable ASA or FTD version AND has WebVPN or AnyConnect web services interface enabled and accessible.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped6.4.0.126.6.46.7.0.2
Apply the Cisco security updates for ASA and FTD software; until patched, restrict user access to the web services interface and educate users about clicking unknown links.
ASA: 9.8.4.34+ / 9.9.2.85+ / 9.12.4.13+ / 9.13.1.21+ | FTD: 6.4.0.12+ / 6.6.4+ / 6.7.0.2+
- 1. Identify the currently running Cisco ASA or FTD software version using 'show version' command
- 2. Determine which software branch (ASA 9.8, 9.9, 9.10, 9.13 or FTD 6.4, 6.5, 6.6, 6.7) your current version belongs to
- 3. For Firepower Threat Defense: Upgrade to version 6.4.0.12 or later, 6.6.4 or later, or 6.7.0.2 or later depending on your branch
- 4. For Adaptive Security Appliance: Upgrade to version 9.8.4.34 or later, 9.9.2.85 or later, 9.12.4.13 or later, or 9.13.1.21 or later depending on your branch
- 5. Download the appropriate software from Cisco's download portal (tools.cisco.com) using valid credentials
- 6. Upload the new image to the device using 'copy' command or through the management interface
- 7. Reload the device with the new image using 'reload' command
- 8. After upgrade, verify the new version is running with 'show version'
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Secure Firewall Threat Defense
Exploited in the wild — priority engagement
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-3580 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2020-3580 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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