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CVE-2020-3511— Cisco IOS and IOS XE Software ISDN Q.931 Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco IOS
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）公司的产品。CLI是其中的一个命令行界面。 Cisco IOS 软件和Cisco IOS XE软件的ISDN子系统存在安全漏洞，该漏洞源于在处理ISDN Q.931消息时输入验证不足所致。 攻击者可利用该漏洞向受影响的设备发送恶意的ISDN Q.931消息，导致进程崩溃，从而重新加载受影响的设备。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2020-3511

Vulnerability Information
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Vulnerability Title
Cisco IOS and IOS XE Software ISDN Q.931 Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the ISDN subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient input validation when the ISDN Q.931 messages are processed. An attacker could exploit this vulnerability by sending a malicious ISDN Q.931 message to an affected device. A successful exploit could allow the attacker to cause the process to crash, resulting in a reload of the affected 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 IOS 和 Cisco IOS XE 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS和IOS XE都是美国思科（Cisco）公司的产品。CLI是其中的一个命令行界面。 Cisco IOS 软件和Cisco IOS XE软件的ISDN子系统存在安全漏洞，该漏洞源于在处理ISDN Q.931消息时输入验证不足所致。 攻击者可利用该漏洞向受影响的设备发送恶意的ISDN Q.931消息，导致进程崩溃，从而重新加载受影响的设备。
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 n/a -

II. Public POCs for CVE-2020-3511

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III. Intelligence Information for CVE-2020-3511

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Vendor Advisories for CVE-2020-3511 (1)

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
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2020-3511

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