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CVE-2025-20115— Cisco IOS XR Software Border Gateway 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，该漏洞源于内存损坏，可能导致拒绝服务。

CVSS 8.6 · High EPSS 0.88% · P58
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I. Basic Information for CVE-2025-20115

Vulnerability Information
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Vulnerability Title
Cisco IOS XR Software Border Gateway Protocol Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in confederation implementation for the Border Gateway Protocol (BGP) in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to a memory corruption that occurs when a BGP update is created with an AS_CONFED_SEQUENCE attribute that has 255 autonomous system numbers (AS numbers). An attacker could exploit this vulnerability by sending a crafted BGP update message, or the network could be designed in such a manner that the AS_CONFED_SEQUENCE attribute grows to 255 AS numbers or more. A successful exploit could allow the attacker to cause memory corruption, which may cause the BGP process to restart, resulting in a DoS condition. To exploit this vulnerability, an attacker must control a BGP confederation speaker within the same autonomous system as the victim, or the network must be designed in such a manner that the AS_CONFED_SEQUENCE attribute grows to 255 AS numbers or more.
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
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
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，该漏洞源于内存损坏，可能导致拒绝服务。
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 6.5.3 -

II. Public POCs for CVE-2025-20115

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III. Intelligence Information for CVE-2025-20115

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Vendor Advisories for CVE-2025-20115 (1)

Same Patch Batch · Cisco · 2025-03-12 · 10 CVEs total

CVE-2025-20138 8.8 HIGH Cisco IOS XR Software CLI Privilege Escalation Vulnerability
CVE-2025-20146 8.6 HIGH Cisco IOS XR Software for ASR 9000 Series Routers Layer 3 Multicast Routing Denial of Serv
CVE-2025-20142 8.6 HIGH Cisco IOS XR Software for ASR 9000 Series Routers L2VPN Denial of Service Vulnerability
CVE-2025-20209 7.5 HIGH Cisco IOS XR Software Internet Key Exchange Version 2 Denial of Service Vulnerability
CVE-2025-20141 7.4 HIGH Cisco IOS XR Software Release 7.9.2 Denial of Service Vulnerabillity
CVE-2025-20177 6.7 MEDIUM Cisco IOS XR Software Image Verification Bypass Vulnerability
CVE-2025-20143 6.7 MEDIUM Cisco IOS XR Software Secure Boot Bypass Vulnerability
CVE-2025-20145 5.8 MEDIUM Cisco IOS XR Software Access Control List Bypass Vulnerability
CVE-2025-20144 4.0 MEDIUM Cisco IOS XR Software Access Control List Bypass Vulnerability

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-120

V. Comments for CVE-2025-20115

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