How severe is CVE-2020-3580?

CVE-2020-3580 has a CVSS score of 6.1/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2020-3580?

Affected package information for CVE-2020-3580 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2020-3580?

No fixed version has been published for CVE-2020-3580 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2020-3580 actively exploited in the wild?

Yes. There are 5 known exploit references for CVE-2020-3580, including 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2020-3580?

CVE-2020-3580 has an EPSS (Exploit Prediction Scoring System) score of 93.3%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2020-3580 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2020-3580 (Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2021-11-03. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-05-03. The required action was: Apply updates per vendor instructions. This CVE has been used in known ransomware campaigns. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2020-3580?

CVE-2020-3580 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2020-3580?

CVE-2020-3580 affects cisco adaptive security appliance software; cisco firepower threat defense. Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2020-3580?

A Nuclei detection template exists for CVE-2020-3580, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2020-3580 published, and has it been updated?

CVE-2020-3580 was published on October 21, 2020 and was last updated on October 28, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2021-11-03 — agencies required to remediate by 2022-05-03 · Ransomware

CVE-2020-3580

MEDIUM

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,…

Published

Oct 21, 2020

Updated

Oct 28, 2025

Affected

0 pkgs

Patched

None yet

Exploits

5 known

EPSS Exploitation Probability

via FIRST.org ↗

93.3%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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 Products

2 products · 9 configurations

adaptive security appliance softwarecisco

≥ 9.15 && < 9.15.1.15

range

firepower threat defensecisco

≥ 6.7.0 && < 6.7.0.2

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Multiple vulnerabilities in the web services interface of Cisco Adaptive…

github.comGithubJun 2021

Multiple vulnerabilities in the web services interface of Cisco Adaptive…

github.comGithubJun 2021

Multiple vulnerabilities in the web services interface of Cisco Adaptive…

cisa.govCISAJul 2021

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2020-3580 in your stack?

O3 detects CVE-2020-3580 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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