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CVE-2022-20758— Cisco IOS XR Software Border Gateway Protocol Ethernet VPN 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存在资源管理错误漏洞，该漏洞源于BGP Ethernet VPN导致Cisco IOS XR致命错误，从而触发拒绝服务。

CVSS 6.8 · Medium EPSS 1.23% · P68

Possible ATT&CK Techniques 1 AI

T1498.001 · Direct Network Flood
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I. Basic Information for CVE-2022-20758

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software Border Gateway Protocol Ethernet VPN Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the implementation of the Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to the incorrect processing of a BGP update message that contains specific EVPN attributes. An attacker could exploit this vulnerability by sending a BGP update message that contains specific EVPN attributes. To exploit this vulnerability, an attacker must control a BGP speaker that has an established trusted peer connection to an affected device that is configured with the address family L2VPN EVPN to receive and process the update message. This vulnerability cannot be exploited by any data that is initiated by clients on the Layer 2 network or by peers that are not configured to accept the L2VPN EVPN address family. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP updates only from explicitly defined peers. For this vulnerability to be exploited, the malicious BGP update message must either come from a configured, valid BGP peer or be injected by the attacker into the affected BGP network on an existing, valid TCP connection to a BGP peer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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资源管理错误漏洞
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存在资源管理错误漏洞，该漏洞源于BGP Ethernet VPN导致Cisco IOS XR致命错误，从而触发拒绝服务。
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-2022-20758

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III. Intelligence Information for CVE-2022-20758

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Same Patch Batch · Cisco · 2022-04-15 · 34 CVEs total

CVE-2022-20695 10.0 CRITICAL Cisco Wireless LAN Controller Management Interface Authentication Bypass Vulnerability
CVE-2022-20622 8.6 HIGH Cisco Embedded Wireless Controller with Catalyst Access Points IP Flood Denial of Service
CVE-2022-20678 8.6 HIGH Cisco IOS XE Software AppNav-XE Denial of Service Vulnerability
CVE-2022-20714 8.6 HIGH Cisco IOS XR Software for ASR 9000 Series Routers Lightspeed-Plus Line Cards Denial of Ser
CVE-2022-20697 8.6 HIGH Cisco IOS and IOS XE Software Web Services Denial of Service Vulnerability
CVE-2022-20682 8.6 HIGH Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Denial of Se
CVE-2022-20683 8.6 HIGH Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers Application Visibility
CVE-2022-20716 7.8 HIGH Cisco SD-WAN Solution Improper Access Control Vulnerability
CVE-2022-20681 7.8 HIGH Cisco IOS XE Software for Cisco Catalyst 9000 Family Switches and Catalyst 9000 Family Wir
CVE-2022-20692 7.7 HIGH Cisco IOS XE Software NETCONF Over SSH Denial of Service Vulnerability
CVE-2022-20684 7.4 HIGH Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family SNMP Trap Denial of
CVE-2022-20761 7.4 HIGH Cisco 1000 Series Connected Grid Router Integrated Wireless Access Point Denial of Service
CVE-2022-20739 7.3 HIGH Cisco SD-WAN vManage Software Privilege Escalation Vulnerability
CVE-2022-20694 6.8 MEDIUM Cisco IOS XE Software Border Gateway Protocol Resource Public Key Infrastructure Denial of
CVE-2022-20679 6.8 MEDIUM Cisco IOS XE Software IPSec Denial of Service Vulnerability
CVE-2022-20735 6.5 MEDIUM Cisco SD-WAN vManage Software Cross-Site Request Forgery Vulnerability
CVE-2022-20747 6.5 MEDIUM Cisco SD-WAN vManage Software Information Disclosure Vulnerability
CVE-2022-20726 5.5 MEDIUM Cisco IOx Application Hosting Environment Vulnerabilities
CVE-2022-20677 5.5 MEDIUM Cisco IOx Application Hosting Environment Vulnerabilities
CVE-2022-20725 5.5 MEDIUM Cisco IOx Application Hosting Environment Vulnerabilities

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

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

V. Comments for CVE-2022-20758

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