CVE-2026-20118— Cisco IOS XR 安全漏洞
一分钟漏洞结论
影响对象
Cisco Cisco IOS XR Software
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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，该漏洞源于特定情况下数据包损坏，可能导致拒绝服务攻击。
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一、 漏洞 CVE-2026-20118 基础信息
漏洞信息
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Vulnerability Title
Cisco IOS-XR NCS 5500 and NCS 5700 Egress Packet Network Interfaces Aligner Interrupt Denial of Service Vulnerability
来源: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the handling of an Egress Packet Network Interface (EPNI) Aligner interrupt in Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series with NC57 line cards and Cisco NCS 5700 Routers and Cisco IOS XR Software for Third Party Software could allow an unauthenticated, remote attacker to cause the network processing unit (NPU) and ASIC to stop processing, preventing traffic from traversing the interface.
This vulnerability is due to the corruption of packets in specific cases when an EPNI Aligner interrupt is triggered while an affected device is experiencing heavy transit traffic. An attacker could exploit this vulnerability by sending a continuous flow of crafted packets to an interface of the affected device. A successful exploit could allow the attacker to cause persistent, heavy packet loss, resulting in a denial of service (DoS) condition.
Note: If active exploitation of this vulnerability is suspected, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider.
Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. This change was made because the affected device operates within a critical network segment where compromise could lead to significant disruption or exposure, thereby elevating the overall risk beyond the base technical severity.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
抛出异常的清理不恰当
来源: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XR 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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，该漏洞源于特定情况下数据包损坏，可能导致拒绝服务攻击。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Cisco | Cisco IOS XR Software | 7.9.1 | - |
|
二、漏洞 CVE-2026-20118 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
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CVE-2026-20118 厂商安全公告 (1)
同批安全公告 · Cisco · 2026-03-11 · 共 6 条
| CVE-2026-20040 | 8.8 HIGH | Cisco IOS XR 操作系统命令注入漏洞 |
| CVE-2026-20046 | 8.8 HIGH | Cisco IOS XR 权限许可和访问控制问题漏洞 |
| CVE-2026-20074 | 7.4 HIGH | Cisco IOS XR 安全漏洞 |
| CVE-2026-20116 | 6.1 MEDIUM | Cisco多款产品 跨站脚本漏洞 |
| CVE-2026-20117 | 6.1 MEDIUM | Cisco Unified Contact Center Express 跨站脚本漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-20118
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