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CVE-2020-3580: Cisco ASA and FTD Cross-Site Scripting (XSS) Vulnerability

criticalknown exploitedpublic exploitCVE-2020-3580
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as 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.

CSIRTS triage

vendor: Ciscoproduct: Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)Cross-site scripting
What
An insufficient input validation vulnerability allows for cross-site scripting (XSS).
Who is affected
Users of Cisco ASA and FTD devices.
Urgency
Immediate action is required due to active exploitation and critical severity.
Action
Apply the latest security patches for ASA and FTD.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2021-11-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-3580

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-3580coverage & exploitation statusNVD · CVE.org

Recent advisories for Cisco ASA and

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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