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CVE-2023-20233

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 Software存在安全漏洞，该漏洞源于连接故障管理（CFM）功能中存在安全漏洞，未经身份验证的攻击者可利用该漏洞在受影响设备上造成拒绝服务（DoS）。

CVSS 4.3 · Medium EPSS 0.34% · P25
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I. Basic Information for CVE-2023-20233

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incorrect processing of invalid continuity check messages (CCMs). An attacker could exploit this vulnerability by sending crafted CCMs to an affected device. A successful exploit could allow the attacker to cause the CFM service to crash when a user displays information about maintenance end points (MEPs) for peer MEPs on an affected device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
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 Software存在安全漏洞，该漏洞源于连接故障管理（CFM）功能中存在安全漏洞，未经身份验证的攻击者可利用该漏洞在受影响设备上造成拒绝服务（DoS）。
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-2023-20233

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III. Intelligence Information for CVE-2023-20233

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Vendor Advisories for CVE-2023-20233 (1)

Same Patch Batch · Cisco · 2023-09-13 · 5 CVEs total

CVE-2023-20236 6.7 MEDIUM Cisco IOS XR 数据伪造问题漏洞
CVE-2023-20191 5.8 MEDIUM Cisco IOS XR 安全漏洞
CVE-2023-20190 5.8 MEDIUM Cisco IOS XR 安全漏洞
CVE-2023-20135 5.7 MEDIUM Cisco IOS XR 安全漏洞

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-476

V. Comments for CVE-2023-20233

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