CVE-2020-3166

Arbitrary file read and write via CLI arguments

Published Feb 26, 2020 · Updated Nov 15, 2024

Improper input validation in Cisco FXOS Software allows local users to read or write arbitrary OS files through its CLI. Cisco has not identified the affected CLI command; it accepts crafted arguments without sufficient validation before performing file access. High-privilege CLI access is required, and successful exploitation exposes or alters files on the appliance OS.

CVSS severity6.7
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Cisco FXOS Software allows local users to read or write arbitrary OS files through its CLI. Cisco has not identified the affected CLI command; it accepts crafted arguments without sufficient validation before performing file access. High-privilege CLI access is required, and successful exploitation exposes or alters files on the appliance OS.

The record

CVE
CVE-2020-3166
Published
Feb 26, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco Firepower eXtensible Operating System (FXOS)
Classifications
CWE-20, T1005
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Feb 26, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

ClamAV · Cisco Firepower eXtensible Operating System (FXOS)version=unspecified <n/a

Published CVSS scores

4.6NIST NVDAV:L/AC:L/Au:N/C:P/I:P/A:P
4.2Cisco Systems, Inc.CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X
6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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