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CVE-2020-26070— Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers Slow Path Forwarding 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 ASR 9000是美国思科（Cisco）公司的一款9000系列聚合服务路由器。 Cisco ASR 9000存在安全漏洞，攻击者可利用该漏洞可以通过慢路径转发触发致命错误，以触发拒绝服务。

CVSS 8.6 · High EPSS 1.90% · P79

Possible ATT&CK Techniques 1 AI

T1499.001 · OS Exhaustion Flood
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I. Basic Information for CVE-2020-26070

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers Slow Path Forwarding Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the ingress packet processing function of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper resource allocation when an affected device processes network traffic in software switching mode (punted). An attacker could exploit this vulnerability by sending specific streams of Layer 2 or Layer 3 protocol data units (PDUs) to an affected device. A successful exploit could cause the affected device to run out of buffer resources, which could make the device unable to process or forward traffic, resulting in a DoS condition. The device would need to be restarted to regain functionality.
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
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco ASR 9000 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco ASR 9000是美国思科（Cisco）公司的一款9000系列聚合服务路由器。 Cisco ASR 9000存在安全漏洞，攻击者可利用该漏洞可以通过慢路径转发触发致命错误，以触发拒绝服务。
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 n/a -

II. Public POCs for CVE-2020-26070

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III. Intelligence Information for CVE-2020-26070

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Vendor Advisories for CVE-2020-26070 (1)

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-404

V. Comments for CVE-2020-26070

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