CVE-2021-1371

Cisco IOS XE SD-WAN Software Console Privilege Escalation Vulnerability

MEDIUM
6.6
CVSS Score
Published: March 24, 2021 at 08:15 PM UTC
Updated: June 17, 2026 at 03:31 AM UTC
18 products affected across 1 vendorIOS Xe Sd WAN4431 Integrated Services Router4331 Integrated Services Router

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Severity
MEDIUM6.6
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

A vulnerability in the role-based access control of Cisco IOS XE SD-WAN Software could allow an authenticated, local attacker with read-only privileges to obtain administrative privileges by using the console port when the device is in the default SD-WAN configuration. This vulnerability occurs because the default configuration is applied for console authentication and authorization. An attacker could exploit this vulnerability by connecting to the console port and authenticating as a read-only user. A successful exploit could allow a user with read-only permissions to access administrative privileges.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

cisco-1100-integrated-services-router (environment) · cisco-1101-integrated-services-router (environment) · cisco-1109-integrated-services-router (environment) · cisco-1111x-integrated-services-router (environment) · cisco-111x-integrated-services-router (environment) · cisco-1120-integrated-services-router (environment) · cisco-1160-integrated-services-router (environment) · cisco-4221-integrated-services-router (environment) · cisco-4321-integrated-services-router (environment) · cisco-4331-integrated-services-router (environment) · cisco-4351-integrated-services-router (environment) · cisco-4431-integrated-services-router (environment) · cisco-4451-integrated-services-router (environment) · cisco-4461-integrated-services-router (environment) · cisco-asr-1000 (environment) · cisco-cloud-services-router-1000v (environment)
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.6MEDIUMcisco
Attack Vector
PHYSICAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-269

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