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CVE-2024-20266

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 DHCPv4 服务器功能中存在安全漏洞，可能允许未经身份验证的远程攻击者触发 dhcpd 进程崩溃，从而导致拒绝服务。

CVSS 5.3 · Medium EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2024-20266

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a crash of the dhcpd process. While the dhcpd process is restarting, which may take approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period and rely on the DHCPv4 server of the affected device. Notes: Only the dhcpd process crashes and eventually restarts automatically. The router does not reload. This vulnerability only applies to DHCPv4. DHCP version 6 (DHCPv6) is not affected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 Software 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 DHCPv4 服务器功能中存在安全漏洞，可能允许未经身份验证的远程攻击者触发 dhcpd 进程崩溃，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-2024-20266

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III. Intelligence Information for CVE-2024-20266

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Vendor Advisories for CVE-2024-20266 (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-2024-20327 7.4 HIGH Cisco ASR 9000 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-2024-20319 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-476

V. Comments for CVE-2024-20266

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