Exploited CVEs / Cisco / CVE-2020-3580
CVE-2020-3580
Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2022-05-03 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Cisco Security Advisories (PSIRT), linked below.
Actively exploited Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) vulnerability, Medium severity, CVSS 6.1. Added to the CISA KEV catalog 2021-11-03.
Risk summary
Updated July 27, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2020-3580
This is an XSS flaw in the web services interface of Cisco ASA and FTD firewalls, triggered by unvalidated user-supplied input. Despite a Medium severity rating of CVSS 6.1, it carries an 86 percent EPSS score, sits on the CISA KEV list since November 2021, and has been used in ransomware campaigns, so the modest score understates the real risk. Any organization exposing the ASA or FTD web management or client-facing interface is a target.
Do this: Apply Cisco's fixed software for ASA and FTD now, and restrict the web services interface to trusted management networks until patched.
AI-generated from public data, 2026-07-25. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2020-3580
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2020-3580
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2022-05-03 (past due).
Apply updates per vendor instructions.
Official fix for CVE-2020-3580
The authoritative fix and affected-version list are published by the vendor. Find the Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) advisory on Cisco Security Advisories (PSIRT).
Common questions about CVE-2020-3580
Is CVE-2020-3580 actively exploited?
Yes. CVE-2020-3580 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 86%. CISA also reports it is known to be used in ransomware campaigns.
What is the CISA deadline and required action for CVE-2020-3580?
CISA set the federal (BOD 22-01) remediation due date at 2022-05-03, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply updates per vendor instructions.
What fixes CVE-2020-3580?
The authoritative fix is in the vendor advisory: see Cisco Security Advisories (PSIRT) for the patched Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2020-3580?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2020-3580's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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Authoritative references
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