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CVE-2020-3580

Cisco ASA and FTD Cross-Site Scripting (XSS)

6.1 MEDIUMActively exploited (CISA KEV)Used in ransomwareEPSS 85.6%
  1. Published21 Oct 2020
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due3 May 2022
Actively exploited (CISA KEV)

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.

Added to KEV: 3 Nov 2021Federal remediation due: 3 May 2022Used in ransomware

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

Cisco Secure Firewall Threat Defense≥ 6.5.0 < 6.6.4 · ≥ 6.7.0 < 6.7.0.2 · < 6.4.0.12
Cisco Adaptive Security Appliance Software≥ 9.10 < 9.12.4.13 · ≥ 9.13 < 9.13.1.21 · ≥ 9.14 < 9.14.2.8 · ≥ 9.15 < 9.15.1.15

Remediation

Fixed in
Cisco Secure Firewall Threat Defense≥ 6.6.4
Cisco Adaptive Security Appliance Software≥ 9.12.4.13

References

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Frequently asked

Is CVE-2020-3580 being actively exploited?

Yes. CVE-2020-3580 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021. It has been used in ransomware campaigns.

How severe is CVE-2020-3580?

CVE-2020-3580 has a CVSS 3.1 base score of 6.1, rated medium. EPSS estimates a 85.6% probability of exploitation.

Which products are affected by CVE-2020-3580?

Affected products include Cisco Secure Firewall Threat Defense, Cisco Adaptive Security Appliance Software.

How do I fix CVE-2020-3580?

Upgrade affected software to a fixed version, for example Cisco Secure Firewall Threat Defense 6.6.4, Cisco Adaptive Security Appliance Software 9.12.4.13 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2020-3580 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.