CVE-2020-3492 : A vulnerability in the Flexible NetFlow Version 9 packet processor of Cisco IOS

A vulnerability in the Flexible NetFlow Version 9 packet processor of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers and Cisco AireOS Software for Cisco Wireless LAN Controllers (WLC) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of certain parameters in a Flexible NetFlow Version 9 record. An attacker could exploit this vulnerability by spoofing the address of an existing Access Point on the network and sending a Control and Provisioning of Wireless Access Points (CAPWAP) packet that includes a crafted Flexible NetFlow Version 9 record to an affected device. A successful exploit could allow the attacker to cause a process crash that would lead to a reload of the device.

Published 2020-09-24 18:15:21

Updated 2021-10-19 18:44:35

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Input validationDenial of service

Products affected by CVE-2020-3492

Cisco » Ios Xe » Version: 16.12.1
cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800-40 » Version: N/A
When used together with: Cisco » Catalyst 9800-80 » Version: N/A
When used together with: Cisco » Catalyst 9800-cl » Version: N/A
When used together with: Cisco » Catalyst 9800-l » Version: N/A
When used together with: Cisco » Catalyst 9800-l-c » Version: N/A
When used together with: Cisco » Catalyst 9800-l-f » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2020-3492

EPSS FAQ

0.16%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 52 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-3492

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.8	HIGH	AV:N/AC:L/Au:N/C:N/I:N/A:C	10.0	6.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
8.6	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	Cisco Systems, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
8.6	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	3.9	4.0	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2020-3492

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)

References for CVE-2020-3492

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-wlc-fnfv9-EvrAQpNX

Cisco IOS XE Software for Catalyst 9800 Series and Cisco AireOS Software for Cisco WLC Flexible NetFlow Version 9 Denial of Service Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2020-3492

Products affected by CVE-2020-3492

Exploit prediction scoring system (EPSS) score for CVE-2020-3492

CVSS scores for CVE-2020-3492

CWE ids for CVE-2020-3492

References for CVE-2020-3492