CVE-2020-3220
MEDIUMCisco IOS XE - Unauthenticated Denial of Service via ESP Packet Tampering
Title source: llmDescription
A vulnerability in the hardware crypto driver of Cisco IOS XE Software for Cisco 4300 Series Integrated Services Routers and Cisco Catalyst 9800-L Wireless Controllers could allow an unauthenticated, remote attacker to disconnect legitimate IPsec VPN sessions to an affected device. The vulnerability is due to insufficient verification of authenticity of received Encapsulating Security Payload (ESP) packets. An attacker could exploit this vulnerability by tampering with ESP cleartext values as a man-in-the-middle.
References (1)
Core 1
Core References
Patch, Vendor Advisory vendor-advisory
x_refsource_cisco
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-vpn-dos-edOmW28Z
Scores
CVSS v3
6.8
EPSS
0.0042
EPSS Percentile
62.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-345
Status
published
Products (50)
cisco/ios_xe
16.4.1
cisco/ios_xe
16.4.2
cisco/ios_xe
16.4.3
cisco/ios_xe
16.5.1
cisco/ios_xe
16.5.1a
cisco/ios_xe
16.5.1b
cisco/ios_xe
16.5.2
cisco/ios_xe
16.5.3
cisco/ios_xe
16.6.1
cisco/ios_xe
16.6.2
... and 40 more
Published
Jun 03, 2020
Tracked Since
Feb 18, 2026