CVE-2020-3220: Cisco IOS XE Software IPsec VPN Denial of Service Vulnerability

Published Jun 3, 2020

Updated

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.

Affected Software

68 affected components

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

Cisco IOS XE=16.6.3

Cisco IOS XE=16.6.4

Cisco IOS XE=16.6.4a

Cisco IOS XE=16.6.4s

Cisco IOS XE=16.6.5

Cisco IOS XE=16.6.5a

Cisco IOS XE=16.6.5b

Cisco IOS XE=16.6.6

Cisco IOS XE=16.7.1

Cisco IOS XE=16.7.1a

Cisco IOS XE=16.7.1b

Cisco IOS XE=16.7.2

Cisco IOS XE=16.7.3

Cisco IOS XE=16.7.4

Cisco IOS XE=16.8.1

Cisco IOS XE=16.8.1a

Cisco IOS XE=16.8.1b

Cisco IOS XE=16.8.1c

Cisco IOS XE=16.8.1d

Cisco IOS XE=16.8.1e

Cisco IOS XE=16.8.1s

Cisco IOS XE=16.8.2

Cisco IOS XE=16.8.3

Cisco IOS XE=16.9.1

Cisco IOS XE=16.9.1a

Cisco IOS XE=16.9.1b

Cisco IOS XE=16.9.1c

Cisco IOS XE=16.9.1d

Cisco IOS XE=16.9.1s

Cisco IOS XE=16.9.2

Cisco IOS XE=16.9.2a

Cisco IOS XE=16.9.2s

Cisco IOS XE=16.9.3

Cisco IOS XE=16.9.3a

Cisco IOS XE=16.9.3h

Cisco IOS XE=16.9.3s

Cisco IOS XE=16.10.1

Cisco IOS XE=16.10.1a

Cisco IOS XE=16.10.1b

Cisco IOS XE=16.10.1c

Cisco IOS XE=16.10.1d

Cisco IOS XE=16.10.1e

Cisco IOS XE=16.10.1f

Cisco IOS XE=16.10.1g

Cisco IOS XE=16.10.1s

Cisco IOS XE=16.10.2

Cisco IOS XE=16.11.1

Cisco IOS XE=16.11.1a

Cisco IOS XE=16.11.1b

Cisco IOS XE=16.11.1c

Cisco IOS XE=16.11.1s

Cisco IOS XE=16.12.1

Cisco IOS XE=16.12.1a

Cisco IOS XE=16.12.1c

Cisco IOS XE=16.12.1s

Cisco IOS XE=16.12.1t

Cisco IOS XE=16.12.1w

Cisco IOS XE=16.12.1y

Remediation

Patch Available

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-vpn-dos-edOmW28Z

Event History

Jun 3, 2020

CVE Published

via MITRE·05:41 PM

Data Sourced

via MITRE·05:41 PM

DescriptionSeverityWeakness

Frequently Asked Questions

What is the severity of CVE-2020-3220?

CVE-2020-3220 has been classified as a high severity vulnerability.

How do I fix CVE-2020-3220?

To fix CVE-2020-3220, upgrade your affected Cisco IOS XE Software to a version that addresses this vulnerability.

Which devices are affected by CVE-2020-3220?

CVE-2020-3220 affects Cisco 4300 Series Integrated Services Routers and Cisco Catalyst 9800-L Wireless Controllers running specific versions of Cisco IOS XE.

What type of attack does CVE-2020-3220 allow?

CVE-2020-3220 allows an unauthenticated remote attacker to disconnect legitimate IPsec VPN sessions.

Is there any workaround for CVE-2020-3220?

There are no documented workarounds for CVE-2020-3220; updating to a patched version is recommended.