CVE-2020-3396

6.8 MEDIUM 0.3% exploit odds Fix listed

What it is

A vulnerability in the file system on the pluggable USB 3.0 Solid State Drive (SSD) for Cisco IOS XE Software could allow an authenticated, physical attacker to remove the USB 3.0 SSD and modify sensitive areas of the file system, including the namespace container protections. The vulnerability occurs because the USB 3.0 SSD control data is not stored on the internal boot flash. An attacker could exploit this vulnerability by removing the USB 3.0 SSD, modifying or deleting files on the USB 3.0 SSD by using another device, and then reinserting the USB 3.0 SSD on the original device. A successful exploit could allow the attacker to remove container protections and perform file actions outside the namespace of the container with root privileges.

At a glance

Exploitability: Can be exploited with physical access with an admin-level account. High risk of data exposure, data tampering.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-09-24 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:18 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 6.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-09-24 18:15 UTC
Last modified: 2026-06-17 03:18 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Weakness: CWE-284 · Improper access control
Record status: Modified

Affected

Cisco iOS Xe 16.12.1

Attack profile CVSS 3.1 · 6.8

Attack vector: Physical
Complexity: Low
Privileges needed: High
User interaction: None
Scope: Changed
Confidentiality: High
Integrity: High
Availability: None

Raw vector

CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record