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CVE-2024-20327

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，该漏洞源于以太网 PPP (PPPoE) 终止功能中存在安全漏洞，可能允许未经身份验证的相邻攻击者破坏 ppp_ma 进程，从而导致拒绝服务。

CVSS 7.4 · High EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-20327

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the PPP over Ethernet (PPPoE) termination feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to crash the ppp_ma process, resulting in a denial of service (DoS) condition. This vulnerability is due to the improper handling of malformed PPPoE packets that are received on a router that is running Broadband Network Gateway (BNG) functionality with PPPoE termination on a Lightspeed-based or Lightspeed-Plus-based line card. An attacker could exploit this vulnerability by sending a crafted PPPoE packet to an affected line card interface that does not terminate PPPoE. A successful exploit could allow the attacker to crash the ppp_ma process, resulting in a DoS condition for PPPoE traffic across the router.
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
输入验证不恰当
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，该漏洞源于以太网 PPP (PPPoE) 终止功能中存在安全漏洞，可能允许未经身份验证的相邻攻击者破坏 ppp_ma 进程，从而导致拒绝服务。
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 5.2.0 -

II. Public POCs for CVE-2024-20327

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III. Intelligence Information for CVE-2024-20327

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Vendor Advisories for CVE-2024-20327 (1)

Same Patch Batch · Cisco · 2024-03-13 · 8 CVEs total

CVE-2024-20320 7.8 HIGH Cisco IOS XR 安全漏洞
CVE-2024-20318 7.4 HIGH Cisco IOS XR 安全漏洞
CVE-2024-20262 6.5 MEDIUM Cisco IOS XR 安全漏洞
CVE-2024-20315 5.8 MEDIUM Cisco IOS XR 安全漏洞
CVE-2024-20322 5.8 MEDIUM Cisco IOS XR 安全漏洞
CVE-2024-20266 5.3 MEDIUM Cisco IOS XR Software 安全漏洞
CVE-2024-20319 4.3 MEDIUM Cisco IOS XR 安全漏洞

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2024-20327

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