CVE-2020-3465

Cisco IOS XE Software Ethernet Frame Denial of Service Vulnerability

MEDIUM
6.5
CVSS Score
Published: September 24, 2020 at 05:53 PM UTC
Updated: June 17, 2026 at 03:18 AM UTC
19 products affected across 1 vendorIOS Xe4331 Integrated Services Router4431 Integrated Services Router

Using Cisco IOS XE Software 16.8.1 by Cisco?

Get instant alerts when new vulnerabilities affect Cisco IOS XE Software 16.8.1 - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
MEDIUM6.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

A vulnerability in Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a device to reload. The vulnerability is due to incorrect handling of certain valid, but not typical, Ethernet frames. An attacker could exploit this vulnerability by sending the Ethernet frames onto the Ethernet segment. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Affected

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

cisco-1100-4p (environment) · cisco-1100-8p (environment) · cisco-1100-terminal-services-gateways (environment) · cisco-1101-4p (environment) · cisco-1109-2p (environment) · cisco-1109-4p (environment) · cisco-1111x-8p (environment) · cisco-4221-integrated-services-router (environment) · cisco-4331-integrated-services-router (environment) · cisco-4431-integrated-services-router (environment) · cisco-4461-integrated-services-router (environment) · cisco-9800-cl (environment) · cisco-9800-l (environment) · cisco-csr-1000v (environment) · cisco-esr6300 (environment) · cisco-ir-1101 (environment) · cisco-isrv (environment) · cisco-vg400 (environment)
All versions
All versions
All versions
All versions
All versions
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 automatablePartial impact

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

CVSS

Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20NVD-CWE-noinfo

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card