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CVE-2021-34713— Cisco IOS XR Software for ASR 9000 Series Routers 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存在安全漏洞，该漏洞源于在路由器上运行的Cisco IOS XR软件的第二层代码存在漏洞，此漏洞是由于对特定以太网帧的错误处理导致旋转循环，从而使网络处理器无响应。这可能允许未经认证的相邻攻击者可利用该漏洞导致受影响的线路卡重新启动。

CVSS 7.4 · High EPSS 0.36% · P27
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I. Basic Information for CVE-2021-34713

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software for ASR 9000 Series Routers Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to cause the affected line card to reboot. This vulnerability is due to incorrect handling of specific Ethernet frames that cause a spin loop that can make the network processors unresponsive. An attacker could exploit this vulnerability by sending specific types of Ethernet frames on the segment where the affected line cards are attached. A successful exploit could allow the attacker to cause the affected line card to reboot.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
资源管理错误
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XR 安全漏洞
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存在安全漏洞，该漏洞源于在路由器上运行的Cisco IOS XR软件的第二层代码存在漏洞，此漏洞是由于对特定以太网帧的错误处理导致旋转循环，从而使网络处理器无响应。这可能允许未经认证的相邻攻击者可利用该漏洞导致受影响的线路卡重新启动。
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 n/a -

II. Public POCs for CVE-2021-34713

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III. Intelligence Information for CVE-2021-34713

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Vendor Advisories for CVE-2021-34713 (1)

Same Patch Batch · Cisco · 2021-09-09 · 13 CVEs total

CVE-2021-34720 8.6 HIGH Cisco IOS XR Software IP Service Level Agreements and Two-Way Active Measurement Protocol
CVE-2021-34718 8.1 HIGH Cisco IOS XR Software Arbitrary File Read and Write Vulnerability
CVE-2021-34728 7.8 HIGH Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerabilities
CVE-2021-34719 7.8 HIGH Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerabilities
CVE-2021-34722 6.7 MEDIUM Cisco IOS XR Software Command Injection Vulnerabilities
CVE-2021-34721 6.7 MEDIUM Cisco IOS XR Software Command Injection Vulnerabilities
CVE-2021-34786 6.5 MEDIUM Cisco BroadWorks CommPilot Application Software Vulnerabilities
CVE-2021-34785 6.5 MEDIUM Cisco BroadWorks CommPilot Application Software Vulnerabilities
CVE-2021-34709 6.0 MEDIUM Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers Ima
CVE-2021-34708 6.0 MEDIUM Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers Ima
CVE-2021-34737 5.8 MEDIUM Cisco IOS XR Software DHCP Version 4 Server Denial of Service Vulnerability
CVE-2021-34771 5.5 MEDIUM Cisco IOS XR Software Unauthorized Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-399

V. Comments for CVE-2021-34713

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