CVE-2023-20027

Cisco IOS XE Software Virtual Fragmentation Reassembly Denial of Service Vulnerability

State: Published
Severity: 8.6 High
Published: Mar 23, 2023
Updated: Oct 28, 2024
Reserved: Oct 27, 2022

Description

A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper reassembly of large packets that occurs when VFR is enabled on either a tunnel interface or on a physical interface that is configured with a maximum transmission unit (MTU) greater than 4,615 bytes. An attacker could exploit this vulnerability by sending fragmented packets through a VFR-enabled interface on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	cisco

Weaknesses

CWE-416

Affected Products

Product	Versions
Cisco IOS XE SoftwareCisco	n/aAffected

References

20230322 Cisco IOS XE Software Virtual Fragmentation Reassembly Denial of Service Vulnerabilityvendor-advisory

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