Input validation error in Cisco Systems, Inc products - CVE-2023-20027

Vulnerability identifier: #VU73988

CSH Severity: High

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

CVE-ID: CVE-2023-20027

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Cisco Systems, Inc

Affected software:
Cisco IOS XE
Cisco 1000 Series Integrated Services Routers
4000 Series Integrated Services Routers
Catalyst 8000V Edge Software
Catalyst 8200 Series Edge Platforms
Catalyst 8300 Series Edge Platforms
Catalyst 8500L Series Edge Platforms
Cloud Services Router 1000V Series

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper reassembly of large packets in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) feature. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Install updates from vendor's website.

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipv4-vfr-dos-CXxtFacb