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CVE-2020-3509— Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers DHCP Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco IOS XE Software
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和IOS XE都是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XE Software Cisco cBR-8 Converged Broadband Routers 的 DHCP message handler 中存在安全漏洞，该漏洞源于在解析DHCP版本4（DHCPv4）消息时没有足够的错误处理引起的，该漏洞允许攻击者可以通过将恶意的DHCPv4消息发送到受影响的设备或通过它的WAN接口发送恶意DHCPv4消息来利用此漏洞。

AI Predicted 7.5 Difficulty: Easy EPSS 1.42% · P72

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2020-3509

Vulnerability Information
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Vulnerability Title
Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers DHCP Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the DHCP message handler of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause the supervisor to crash, which could result in a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when DHCP version 4 (DHCPv4) messages are parsed. An attacker could exploit this vulnerability by sending a malicious DHCPv4 message to or through a WAN interface of an affected device. A successful exploit could allow the attacker to cause a reload of the affected device. Note: On Cisco cBR-8 Converged Broadband Routers, all of the following are considered WAN interfaces: 10 Gbps Ethernet interfaces 100 Gbps Ethernet interfaces Port channel interfaces that include multiple 10 and/or 100 Gbps Ethernet interfaces
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
7PK-错误
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XE Software和Cisco cBR-8 Converged Broadband Routers DHCP message handler 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS和IOS XE都是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XE Software Cisco cBR-8 Converged Broadband Routers 的 DHCP message handler 中存在安全漏洞，该漏洞源于在解析DHCP版本4（DHCPv4）消息时没有足够的错误处理引起的，该漏洞允许攻击者可以通过将恶意的DHCPv4消息发送到受影响的设备或通过它的WAN接口发送恶意DHCPv4消息来利用此漏洞。
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 n/a -

II. Public POCs for CVE-2020-3509

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III. Intelligence Information for CVE-2020-3509

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Same Patch Batch · Cisco · 2020-09-24 · 52 CVEs total

CVE-2020-3141 8.8 HIGH Cisco IOS XE Software Privilege Escalation Vulnerabilities
CVE-2020-3425 8.8 HIGH Cisco IOS XE Software Privilege Escalation Vulnerabilities
CVE-2020-3480 8.6 HIGH Cisco IOS XE Software Zone-Based Firewall Denial of Service Vulnerabilities
CVE-2020-3399 8.6 HIGH Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Se
CVE-2020-3421 8.6 HIGH Cisco IOS XE Software Zone-Based Firewall Denial of Service Vulnerabilities
CVE-2020-3426 7.5 HIGH Cisco IOS Software for Cisco Industrial Routers Virtual-LPWA Unauthorized Access Vulnera
CVE-2020-3465 7.4 HIGH Cisco IOS XE Software Ethernet Frame Denial of Service Vulnerability
CVE-2020-3508 7.4 HIGH Cisco IOS XE Software for Cisco ASR 1000 Series 20-Gbps Embedded Services Processor IP ARP
CVE-2020-3396 6.8 MEDIUM Cisco IOS XE Software IOx Guest Shell USB SSD Namespace Protection Privilege Escalation Vu
CVE-2020-3417 6.8 MEDIUM Cisco IOS XE Software Arbitrary Code Execution Vulnerability
CVE-2020-3513 6.7 MEDIUM Cisco IOS XE Software for Cisco ASR 900 Series Route Switch Processor 3 Arbitrary Code Exe
CVE-2020-3416 6.7 MEDIUM Cisco IOS XE Software for Cisco ASR 900 Series Route Switch Processor 3 Arbitrary Code Exe
CVE-2020-3479 6.1 MEDIUM Cisco IOS and IOS XE Software MP-BGP EVPN Denial of Service Vulnerability
CVE-2020-3503 6.0 MEDIUM Cisco IOS XE Software Guest Shell Unauthorized File System Access Vulnerability
CVE-2020-3393 6.0 MEDIUM Cisco IOS XE Software IOx Application Hosting Privilege Escalation Vulnerability
CVE-2020-3423 5.1 MEDIUM Cisco IOS XE Software Arbitrary Code Execution Vulnerability
CVE-2020-3475 4.3 MEDIUM Cisco IOS XE Software Web Management Framework Vulnerabilities
CVE-2020-3474 4.3 MEDIUM Cisco IOS XE Software Web Management Framework Vulnerabilities
CVE-2020-3407 Cisco IOS XE Software RESTCONF and NETCONF-YANG Access Control List Denial of Service Vuln
CVE-2020-3409 Cisco IOS and IOS XE Software PROFINET Denial of Service Vulnerability

Showing top 20 of 52 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco IOS XE Software
Same vendor: Cisco
Same weakness: CWE-388

V. Comments for CVE-2020-3509

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