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CVE-2021-34720— Cisco IOS XR Software IP Service Level Agreements and Two-Way Active Measurement Protocol 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Cisco IOS XR 软件的 IP 服务级别协议 (IP SLA) 响应程序和双向主动测量协议 (TWAMP) 功能对套接字创建失败处理不当。攻击者可以通过向受影响的设备发送特定的 IP SLA 或 TWAMP 数据包来利用此漏洞。 漏洞可能允许未经身份验证的远程攻击者将设备数据包内存耗尽或导致 IP SLA 进程崩溃，导致拒绝服务 (DoS) 攻击。

CVSS 8.6 · High EPSS 1.29% · P69
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I. Basic Information for CVE-2021-34720

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software IP Service Level Agreements and Two-Way Active Measurement Protocol Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the IP Service Level Agreements (IP SLA) responder and Two-Way Active Measurement Protocol (TWAMP) features of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause device packet memory to become exhausted or cause the IP SLA process to crash, resulting in a denial of service (DoS) condition. This vulnerability exists because socket creation failures are mishandled during the IP SLA and TWAMP processes. An attacker could exploit this vulnerability by sending specific IP SLA or TWAMP packets to an affected device. A successful exploit could allow the attacker to exhaust the packet memory, which will impact other processes, such as routing protocols, or crash the IP SLA process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对活跃已分配资源丧失索引
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Cisco IOS XR 软件的 IP 服务级别协议 (IP SLA) 响应程序和双向主动测量协议 (TWAMP) 功能对套接字创建失败处理不当。攻击者可以通过向受影响的设备发送特定的 IP SLA 或 TWAMP 数据包来利用此漏洞。 漏洞可能允许未经身份验证的远程攻击者将设备数据包内存耗尽或导致 IP SLA 进程崩溃，导致拒绝服务 (DoS) 攻击。
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-2021-34720

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III. Intelligence Information for CVE-2021-34720

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Vendor Advisories for CVE-2021-34720 (1)

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

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-2021-34713 7.4 HIGH Cisco IOS XR Software for ASR 9000 Series Routers Denial of Service Vulnerability
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-771

V. Comments for CVE-2021-34720

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