EUVD-2026-15431

| CVE-2026-20084 HIGH
2026-03-25 cisco GHSA-m8vf-g949-jwr2
8.6
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
EUVD ID Assigned
Mar 25, 2026 - 16:16 euvd
EUVD-2026-15431
Analysis Generated
Mar 25, 2026 - 16:16 vuln.today
CVE Published
Mar 25, 2026 - 16:02 nvd
HIGH 8.6

Tags

Cisco Denial Of Service Apple

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.

Analysis

Improper BOOTP packet handling in Cisco IOS XE Software on Catalyst 9000 Series Switches allows unauthenticated remote attackers to trigger VLAN leakage and cause device unavailability through resource exhaustion. An attacker can send crafted BOOTP requests to forward packets across VLANs, leading to high CPU utilization that renders the switch unreachable and unable to process traffic. …

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Remediation

Within 24 hours: Inventory all Cisco Catalyst 9000 Series Switches in production and verify current IOS XE versions; enable detailed logging on DHCP snooping events and implement BOOTP rate-limiting at network edge. Within 7 days: Deploy network segmentation to restrict BOOTP packet forwarding across VLANs; disable DHCP snooping on non-essential VLANs if business operations permit; establish baseline CPU utilization metrics for early anomaly detection. …

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Priority Score

43
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +43
POC: 0

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EUVD-2026-15431 vulnerability details – vuln.today
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