CVE-2020-3220
high-risk
Published 2020-06-03
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.
Do I need to act?
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0.42% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
6
CVSS 6.8/10
Medium
NETWORK
/ HIGH complexity
Affected Products (20)
Affected Vendors
51
/ 100
high-risk
Severity
21/34 · High
Exploitability
2/34 · Minimal
Exposure
28/34 · Critical