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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco IOS XE Software affected
Version Status Constraints
16.6.1 affected —
16.6.2 affected —
16.6.3 affected —
16.6.4 affected —
16.6.5 affected —
16.6.4a affected —
16.6.6 affected —
16.6.7 affected —
16.6.8 affected —
16.6.9 affected —
16.6.10 affected —
16.7.1 affected —
16.8.1 affected —
16.8.1a affected —
16.8.1s affected —
16.9.1 affected —
16.9.2 affected —
16.9.1s affected —
16.9.3 affected —
16.9.4 affected —
16.9.5 affected —
16.9.6 affected —
16.9.7 affected —
16.9.8 affected —
16.10.1 affected —
16.10.1s affected —
16.10.1e affected —
16.11.1 affected —
16.11.1b affected —
16.11.1s affected —
16.12.1 affected —
16.12.1s affected —
16.12.1c affected —
16.12.2 affected —
16.12.3 affected —
16.12.8 affected —
16.12.2s affected —
16.12.4 affected —
16.12.3s affected —
16.12.3a affected —
16.12.4a affected —
16.12.5 affected —
16.12.6 affected —
16.12.5b affected —
16.12.6a affected —
16.12.7 affected —
17.1.1 affected —
17.1.1s affected —
17.1.1t affected —
17.1.3 affected —
17.2.1 affected —
17.2.1a affected —
17.3.1 affected —
17.3.2 affected —
17.3.3 affected —
17.3.2a affected —
17.3.4 affected —
17.3.5 affected —
17.3.6 affected —
17.3.7 affected —
17.3.8 affected —
17.3.8a affected —
17.4.1 affected —
17.5.1 affected —
17.6.1 affected —
17.6.2 affected —
17.6.3 affected —
17.6.1y affected —
17.6.4 affected —
17.6.5 affected —
17.6.6 affected —
17.6.6a affected —
17.6.5a affected —
17.6.7 affected —
17.6.8 affected —
17.7.1 affected —
17.10.1 affected —
17.10.1b affected —
17.8.1 affected —
17.9.1 affected —
17.9.2 affected —
17.9.3 affected —
17.9.4 affected —
17.9.5 affected —
17.9.4a affected —
17.9.6 affected —
17.9.6a affected —
17.9.7 affected —
17.9.8 affected —
17.11.1 affected —
17.12.1 affected —
17.12.2 affected —
17.12.3 affected —
17.12.4 affected —
17.12.5 affected —
17.12.1z5 affected —
17.13.1 affected —
17.14.1 affected —
17.15.1 affected —
17.15.2 affected —
17.15.3 affected —
17.15.2b affected —
17.15.4 affected —
17.15.4d affected —
17.16.1 affected —
17.17.1 affected —
17.18.1 affected —

No data.

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA cve-icon cve-icon
History

Wed, 25 Mar 2026 22:00:00 +0000

Type Values Removed Values Added
Title Bootp VLAN Leakage in Cisco IOS XE DHCP Snooping Leading to Denial of Service

Wed, 25 Mar 2026 16:15:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-03-25T16:02:39.119Z

Reserved: 2025-10-08T11:59:15.366Z

Link: CVE-2026-20084

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-25T16:16:13.563

Modified: 2026-03-25T16:16:13.563

Link: CVE-2026-20084

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-03-25T21:30:58Z

Weaknesses