What is CVE-2020-3580?

CVE-2020-3580 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-10-21.

How severe is CVE-2020-3580?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2020-3580 known to be exploited?

Yes. CVE-2020-3580 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 21 public proof-of-concept repositories are indexed.

XSS in Cisco Adaptive Security Appliance Software

CVE-2020-3580

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.856 (99.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2021-11-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-05-03.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Patch, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2020-3580?: CVE-2020-3580 is a medium-severity vulnerability in Cisco Adaptive Security Appliance Software, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-10-21.
How severe is CVE-2020-3580?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2020-3580 known to be exploited?: Yes. CVE-2020-3580 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating it is being actively exploited. 21 public proof-of-concept repositories are indexed.