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CVE-2020-3221— Cisco IOS XE Software Flexible NetFlow Version 9 Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco IOS XE Software 16.10.1
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco IOS XE是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco Catalyst 9800 Series Wireless Controllers中的IOS XE的Flexible NetFlow 9版本数据包处理器存在输入验证错误漏洞。攻击者可通过将格式错误的Flexible NetFlow 9版本数据包发送到受影响设备的CAPWAP数据端口利用该漏洞造成无限循环，导致进程崩溃，进而导致设备重新加载。

AI Predicted 7.5 Difficulty: Easy EPSS 1.51% · P72
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I. Basic Information for CVE-2020-3221

Vulnerability Information
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Vulnerability Title
Cisco IOS XE Software Flexible NetFlow Version 9 Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Flexible NetFlow Version 9 packet processor of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of parameters in a Flexible NetFlow Version 9 record. An attacker could exploit this vulnerability by sending a malformed Flexible NetFlow Version 9 packet to the Control and Provisioning of Wireless Access Points (CAPWAP) data port of an affected device. An exploit could allow the attacker to trigger an infinite loop, resulting in a process crash that would cause a reload of the device.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Catalyst 9800 Series Wireless Controllers IOS XE 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XE是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco Catalyst 9800 Series Wireless Controllers中的IOS XE的Flexible NetFlow 9版本数据包处理器存在输入验证错误漏洞。攻击者可通过将格式错误的Flexible NetFlow 9版本数据包发送到受影响设备的CAPWAP数据端口利用该漏洞造成无限循环，导致进程崩溃，进而导致设备重新加载。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco IOS XE Software 16.10.1 n/a -

II. Public POCs for CVE-2020-3221

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III. Intelligence Information for CVE-2020-3221

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Vendor Advisories for CVE-2020-3221 (1)

Same Patch Batch · Cisco · 2020-06-03 · 50 CVEs total

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CVE-2020-3333 Cisco Application Services Engine Software Unauthenticated Event Policies Update Vulnerabi
CVE-2020-3257 Cisco IOx Application Environment for IOS Software for Cisco Industrial Routers Vulnerabil
CVE-2020-3267 Cisco Unified Contact Center Express Improper API Authorization Vulnerability
CVE-2020-3258 Cisco IOS Software for Cisco Industrial Routers Arbitrary Code Execution Vulnerabilities
CVE-2020-3281 Cisco Digital Network Architecture Center Information Disclosure Vulnerability
CVE-2020-3232 Cisco ASR 920 Series Aggregation Services Router Model 12SZ-IM SNMP Denial of Service Vuln
CVE-2020-3200 Cisco IOS and IOS XE Software Secure Shell Denial of Service Vulnerability
CVE-2020-3199 Cisco IOx Application Environment for IOS Software for Cisco Industrial Routers Vulnerabil
CVE-2020-3198 Cisco IOS Software for Cisco Industrial Routers Arbitrary Code Execution Vulnerabilities
CVE-2020-3228 Cisco IOS, IOS XE, and NX-OS Software Security Group Tag Exchange Protocol Denial of Servi
CVE-2020-3231 Cisco IOS Software for Catalyst 2960-L Series Switches and Catalyst CDB-8P Switches 802.1X
CVE-2020-3230 Cisco IOS and IOS XE Software Internet Key Exchange Version 2 Denial of Service Vulnerabil
CVE-2020-3229 Cisco IOS XE Software Web UI Privilege Escalation Vulnerability
CVE-2020-3227 Cisco IOx for IOS XE Software Privilege Escalation Vulnerability
CVE-2020-3225 Cisco IOS and IOS XE Software Common Industrial Protocol Denial of Service Vulnerabilities
CVE-2020-3233 Cisco IOx Application Framework Local Manager Stored Cross-Site Scripting Vulnerability

Showing top 20 of 50 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco IOS XE Software 16.10.1
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2020-3221

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