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CVE-2020-3580

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

MEDIUM
6.1
CVSS Score
Published: October 21, 2020 at 06:40 PM UTC
Updated: August 11, 2026 at 07:58 PM UTC
2 products affected across 1 vendorAdaptive Security ApplianceSecure Firewall Threat Defense

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Severity
MEDIUM6.1
Exploitation
CISA KEV
Exploit prediction
EPSS 86%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score85.6%

EPSS (Exploit Prediction Scoring System) estimates a 85.6% chance this CVE is exploited in the wild within the next 30 days — higher than 100% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an insufficient input validation vulnerability for user-supplied input by the web services interface. Successful exploitation could allow an attacker to perform cross-site scripting (XSS) in the context of the interface or access sensitive browser-based information.

Required Action
Apply updates per vendor instructions.
Ransomware Use
Known
Added to KEV
Nov 3, 2021
Remediation Due
May 3, 2022
1639 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2020-3580

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Adaptive Security Appliance· Cisco
95%
v < 9.8.4.349.10 ≤ v < 9.12.4.139.13 ≤ v < 9.13.1.219.14 ≤ v < 9.14.2.89.15 ≤ v < 9.15.1.159.9 ≤ v < 9.9.2.85
Affected range stops below 9.12.4.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.13.1.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.14.2.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.15.1.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.8.4.34, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.9.2.85, so it looks safe — our inference, not a vendor statement
Secure Firewall Threat Defense· Cisco
95%
v < 6.4.0.126.5.0 ≤ v < 6.6.46.7.0 ≤ v < 6.7.0.2
Affected range stops below 6.4.0.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.6.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.7.0.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisoryx_refsource_CISCOPatch
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-multiple-FCB3vPZe
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-3580

SSVC — Action Prioritization

SSVCActiveNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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