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Arbitrary File Read and Write in Cisco FXOS Software

Published: 2020-02-27
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-3166
Exploitation vector Local
Public exploit N/A
Vulnerable software
Cisco FXOS
Operating systems & Components / Operating system

Cisco ASA
Hardware solutions / Security hardware applicances

Cisco Firepower Threat Defense (FTD)
Hardware solutions / Security hardware applicances

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one low risk vulnerability.

1) Input validation error

Severity: Low

CVSSv3: 3.7 [CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3166

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No


The vulnerability allows a local user to read or write arbitrary files on the target system.

The vulnerability exists due to insufficient validation of user-supplied input. A local user can include specially crafted arguments to a specific CLI command and read or write to arbitrary files on the underlying OS.

This vulnerability affects the following Cisco products if they are running a vulnerable release of Cisco FXOS Software:

  • Firepower 1000 Series
  • Firepower 2100 Series
  • Firepower 4100 Series
  • Firepower 9300 Security Appliances


Install updates from vendor's website.

Vulnerable software versions

Cisco FXOS: -, 2.2, 2.3, 2.4, 2.6

Cisco ASA: 9.8, 9.9, 9.10, 9.12, 9.13

Cisco Firepower Threat Defense (FTD): 6.2.2, 6.2.3, 6.3.0, 6.4.0, 6.5.0

CPE External links

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.