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CVE-2026-20084

Quick assessment

Affected
Cisco Cisco IOS XE 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 XE Software是美国思科（Cisco）公司的一种网络操作系统。 Cisco IOS XE Software存在资源管理错误漏洞，该漏洞源于对BOOTP数据包处理不当，可能导致BOOTP数据包在VLAN间转发并引发拒绝服务。

CVSS 8.6 · High EPSS 0.35% · P29
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I. Basic Information for CVE-2026-20084

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets. There are workarounds that address this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco IOS XE Software 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XE Software是美国思科（Cisco）公司的一种网络操作系统。 Cisco IOS XE Software存在资源管理错误漏洞，该漏洞源于对BOOTP数据包处理不当，可能导致BOOTP数据包在VLAN间转发并引发拒绝服务。
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 XE Software 16.6.1 -

II. Public POCs for CVE-2026-20084

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III. Intelligence Information for CVE-2026-20084

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Vendor Advisories for CVE-2026-20084 (1)

Same Patch Batch · Cisco · 2026-03-25 · 13 CVEs total

CVE-2026-20086 8.6 HIGH Cisco IOS XE Wireless Controller software 安全漏洞
CVE-2026-20012 8.6 HIGH Cisco多款产品 安全漏洞
CVE-2026-20125 7.7 HIGH Cisco IOS和Cisco IOS XE Software 安全漏洞
CVE-2026-20004 7.4 HIGH Cisco IOS XE Software 安全漏洞
CVE-2026-20110 6.5 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2026-20083 6.5 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2026-20104 6.1 MEDIUM Cisco多款产品 安全漏洞
CVE-2026-20115 6.1 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2026-20114 5.4 MEDIUM Cisco IOS XE Software 安全漏洞
CVE-2026-20108 5.4 MEDIUM Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage） 跨站脚本漏洞
CVE-2026-20113 5.3 MEDIUM Cisco IOS XE Software 注入漏洞
CVE-2026-20112 4.8 MEDIUM Cisco IOS XE Software 跨站脚本漏洞

IV. Related Vulnerabilities

Same product: Cisco IOS XE Software
Same vendor: Cisco
Same weakness: CWE-400

V. Comments for CVE-2026-20084

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