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CVE-2019-1918— Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco IOS XR 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 XR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 XR 6.5.1版本至6.6.3版本中的中间系统到中间系统（IS–IS）路由协议存在输入验证错误漏洞，该漏洞源于程序没有正确处理IS–IS链路协议数据单元。攻击者可利用该漏洞造成IS–IS进程崩溃，导致拒绝服务。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1527
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I. Basic Information for CVE-2019-1918

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the implementation of Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XR Software could allow an unauthenticated attacker who is in the same IS-IS area to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of IS–IS link-state protocol data units (PDUs). An attacker could exploit this vulnerability by sending specific link-state PDUs to an affected system to be processed. A successful exploit could allow the attacker to cause incorrect calculations used in the weighted remote shared risk link groups (SRLG) or in the IGP Flexible Algorithm. It could also cause tracebacks to the logs or potentially cause the receiving device to crash the IS–IS process, resulting in a DoS condition.
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 XR 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XR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 XR 6.5.1版本至6.6.3版本中的中间系统到中间系统（IS–IS）路由协议存在输入验证错误漏洞，该漏洞源于程序没有正确处理IS–IS链路协议数据单元。攻击者可利用该漏洞造成IS–IS进程崩溃，导致拒绝服务。
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 XR Software unspecified ~ n/a -

II. Public POCs for CVE-2019-1918

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III. Intelligence Information for CVE-2019-1918

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Vendor Advisories for CVE-2019-1918 (1)

Same Patch Batch · Cisco · 2019-08-07 · 15 CVEs total

CVE-2019-1945 Cisco Adaptive Security Appliance Smart Tunnel Vulnerabilities
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CVE-2019-1929 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulne
CVE-2019-1934 Cisco Adaptive Security Appliance Software Web-Based Management Interface Privilege Escala
CVE-2019-1944 Cisco Adaptive Security Appliance Smart Tunnel Vulnerabilities
CVE-2019-1926 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulne
CVE-2019-1927 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulne
CVE-2019-1924 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulne
CVE-2019-1925 Cisco Webex Network Recording Player and Cisco Webex Player Arbitrary Code Execution Vulne
CVE-2019-1910 Cisco IOS XR Software Intermediate System to Intermediate System Denial of Service Vulnera
CVE-2019-1895 Cisco Enterprise NFV Infrastructure Software VNC Authentication Bypass Vulnerability
CVE-2019-1913 Cisco Small Business 220 Series Smart Switches Remote Code Execution Vulnerabilities
CVE-2019-1914 Cisco Small Business 220 Series Smart Switches Command Injection Vulnerability
CVE-2019-1912 Cisco Small Business 220 Series Smart Switches Authentication Bypass Vulnerability

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2019-1918

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