CVE-2021-34737 (CNNVD-202109-399)

MEDIUM
中文标题:
Cisco IOS XR 代码问题漏洞
英文标题:
Cisco IOS XR Software DHCP Version 4 Server Denial of Service Vulnerability
CVSS分数: 5.8
发布时间: 2021-09-09 05:01:30
漏洞类型: 代码问题
状态: PUBLISHED
数据质量分数: 0.30
数据版本: v3
漏洞描述
中文描述:

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软件的DHCP服务器功能(DHCPv4版本)存在代码问题漏洞，该漏洞源于某些DHCPv4消息在受影响的设备处理时未经正确验证。攻击者可利用该漏洞通过向受影响的设备发送格式错误的DHCPv4消息导致空指针解引用，从而导致系统崩溃

英文描述:

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 NULL pointer dereference, resulting in a crash of the dhcpd process. While the dhcpd process is restarting, which may take up to 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. Note: Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.

CWE类型:
CWE-476
标签:
（暂无数据）
受影响产品
厂商 产品 版本 版本范围 平台 CPE
Cisco Cisco IOS XR Software n/a - - cpe:2.3:a:cisco:cisco_ios_xr_software:n_a:*:*:*:*:*:*:*
cisco ios_xr * - - cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
解决方案
中文解决方案:
（暂无数据）
英文解决方案:
（暂无数据）
临时解决方案:
（暂无数据）
参考链接
20210908 Cisco IOS XR Software DHCP Version 4 Server Denial of Service Vulnerability vendor-advisory
cve.org
访问
CVSS评分详情
3.1 (cna)
MEDIUM
5.8
CVSS向量: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
机密性
NONE
完整性
NONE
可用性
LOW
时间信息
发布时间:
2021-09-09 05:01:30
修改时间:
2024-11-07 22:00:23
创建时间:
2025-11-11 15:36:55
更新时间:
2025-11-11 15:56:55
利用信息
暂无可利用代码信息
数据源详情
数据源 记录ID 版本 提取时间
CVE cve_CVE-2021-34737 2025-11-11 15:21:00 2025-11-11 07:36:55
NVD nvd_CVE-2021-34737 2025-11-11 14:57:42 2025-11-11 07:45:13
CNNVD cnnvd_CNNVD-202109-399 2025-11-11 15:10:43 2025-11-11 07:56:55
版本与语言
当前版本: v3
主要语言: EN
支持语言:
EN ZH
安全公告
暂无安全公告信息
变更历史
v3 CNNVD
2025-11-11 15:56:55
vulnerability_type: 未提取 → 代码问题; cnnvd_id: 未提取 → CNNVD-202109-399; data_sources: ['cve', 'nvd'] → ['cnnvd', 'cve', 'nvd']
查看详细变更
  • vulnerability_type: 未提取 -> 代码问题
  • cnnvd_id: 未提取 -> CNNVD-202109-399
  • data_sources: ['cve', 'nvd'] -> ['cnnvd', 'cve', 'nvd']
v2 NVD
2025-11-11 15:45:13
affected_products_count: 1 → 2; data_sources: ['cve'] → ['cve', 'nvd']
查看详细变更
  • affected_products_count: 1 -> 2
  • data_sources: ['cve'] -> ['cve', 'nvd']