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CVE-2020-3452: Cisco ASA and FTD Read-Only Path Traversal Vulnerability

criticalknown exploitedpublic exploitCVE-2020-3452
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 improper input validation vulnerability when HTTP requests process URLs. An attacker could exploit this vulnerability by sending a crafted HTTP request containing directory traversal character sequences to an affected device. A successful exploit could allow the attacker to view arbitrary files within the web services file system on the targeted device.

CSIRTS triage

vendor: Ciscoproduct: Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)Path traversal
What
An improper input validation vulnerability allows an attacker to view arbitrary files within the web services file system.
Who is affected
Deployments of Cisco ASA and FTD devices.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest patches for Cisco 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-2020-3452

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-2020-3452coverage & 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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