8.6

CVE-2026-20084

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
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Produkt Cisco IOS XE Software
Version 16.6.1
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Version 16.6.2
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Version 16.6.3
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Version 16.6.4
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Version 16.6.5
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Version 16.6.4a
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Version 16.6.6
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Version 16.6.7
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Version 16.6.8
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Version 16.6.9
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Version 16.6.10
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Version 16.7.1
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Version 16.8.1
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Version 16.8.1a
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Version 16.8.1s
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Version 16.9.1
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Version 16.9.2
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Version 16.9.1s
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Version 16.9.7
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Version 16.9.8
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Version 16.10.1
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Version 16.10.1s
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Version 16.10.1e
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Version 16.11.1
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Version 16.11.1b
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Version 16.12.1
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Version 16.12.1s
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Version 17.1.1
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Version 17.1.1t
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Version 17.1.3
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Version 17.2.1
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Version 17.5.1
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Version 17.6.1
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Version 17.6.1y
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Version 17.7.1
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Version 17.10.1
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Version 17.10.1b
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Version 17.8.1
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Version 17.9.1
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Version 17.9.7
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Version 17.11.1
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Version 17.12.1
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Version 17.12.1z5
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Version 17.13.1
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Version 17.14.1
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Version 17.15.1
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Version 17.15.2
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Version 17.15.3
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Version 17.15.2b
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Version 17.15.4
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Version 17.15.4d
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Version 17.16.1
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Version 17.17.1
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Version 17.18.1
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VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.355
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
psirt@cisco.com 8.6 3.9 4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-400 Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.