Arbitrary File Overwrite in Cisco IOS XE Software

Published: 2020-09-30
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-3476
Exploitation vector Local
Public exploit N/A
Vulnerable software
Cisco IOS XE
Operating systems & Components / Operating system

Vendor Cisco Systems, Inc

Security Advisory

This security advisory describes one low risk vulnerability.

1) Files or Directories Accessible to External Parties

Risk: Low

CVSSv3: 3.9 [CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-3476

CWE-ID: CWE-552 - Files or Directories Accessible to External Parties

Exploit availability: No


The vulnerability allows a local user to overwrite arbitrary files in the underlying host file system.

The vulnerability exists due to insufficient validation of the parameters of a specific CLI command. A local administrator can issue that command with specific parameters and overwrite the content of any arbitrary file that resides on the underlying host file system.


Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE: 16.9, Gibraltar-16.10.1

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.