PT-2023-2218 · Cisco · Cisco Ios Xe

Published 2023-03-22 · Updated 2023-05-22 · CVE-2023-20027

Positive Technologies (AI Summary)

CVSS v3.1

8.6

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Cisco IOS XE Software (affected versions not specified)

Description A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature 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.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2023-01966

CVE-2023-20027

Affected Products

Cisco Ios Xe

References · 8

• https://osv.dev/vulnerability/CVE-2023-20027 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-20027 · Security Note
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipv4-vfr-dos-CXxtFacb · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-01966 · Security Note
• https://t.me/cvenotify/46722 · Telegram Post
• https://t.me/true_secator/4210 · Telegram Post
• https://t.me/cibsecurity/60596 · Telegram Post
• https://t.me/cvenotify/50926 · Telegram Post