CVE-2020-3396

Cisco IOS XE Software IOx Guest Shell USB SSD Namespace Protection Privilege Escalation Vulnerability

At a glance

Severity
MEDIUM 6.8
EPSS
EPSS 0.32 % · percentile 25 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
cisco
NVD status
Modified

Description

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.

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 6.8CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:Ncisco
CVSS 3.1MEDIUM 6.8CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:NNVD · psirt@cisco.com (Secondary)
CVSS 3.1HIGH 7.2CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)
CVSS 2.0MEDIUM 6.9AV:L/AC:M/Au:N/C:C/I:C/A:CNVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

European references

Affected configurations (NVD CPE)

Affected products

ProductVersions
Cisco · Cisco IOS XE Softwareaffected n/a

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD