Input validation error in Cisco Systems, Inc products - CVE-2023-20027
Published: March 23, 2023
Vulnerability identifier: #VU73988
CSH Severity: High
CVSS v4: 8.7 [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]
CVE-ID: CVE-2023-20027
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
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
Cisco IOS XE
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
Cisco IOS XE
How to mitigate CVE-2023-20027
Install updates from vendor's website.
Cisco IOS XE - addressed in versions 17.3.6, 17.6.4, 17.6.5, 17.9.1, 17.9.1w, 17.9.1x, 17.9.1x1, 17.9.1a, 17.9.2, 17.9.2a, 17.9.3, 17.10.1, 17.10.1a, 17.10.1b