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CVE-2023-20227

HIGHCVSS 7.5/10EPSS 0.65%

Last modified

CVE-2023-20227 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the Layer 2 Tunneling Protocol (L2TP) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain L2TP packets. An attacker could exploit this vulnerability by sending crafted L2TP packets to an affected device. EPSS estimates a 0.65% chance of exploitation in the next 30 days.

Description

A vulnerability in the Layer 2 Tunneling Protocol (L2TP) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain L2TP packets. An attacker could exploit this vulnerability by sending crafted L2TP packets to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. Note: Only traffic directed to the affected system can be used to exploit this vulnerability.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.65%

46.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xe16.8.1
CiscoIos Xe16.8.1a
CiscoIos Xe16.8.1b
CiscoIos Xe16.8.1c
CiscoIos Xe16.8.1d
CiscoIos Xe16.8.1e
CiscoIos Xe16.8.1s
CiscoIos Xe16.8.2
CiscoIos Xe16.8.3
CiscoIos Xe16.9.1
CiscoIos Xe16.9.1a
CiscoIos Xe16.9.1b
CiscoIos Xe16.9.1s
CiscoIos Xe16.9.2
CiscoIos Xe16.9.3
CiscoIos Xe16.9.4
CiscoIos Xe16.9.5
CiscoIos Xe16.9.5f
CiscoIos Xe16.9.6
CiscoIos Xe16.9.7
CiscoIos Xe16.9.8
CiscoIos Xe16.10.1
CiscoIos Xe16.10.1a
CiscoIos Xe16.10.1b
CiscoIos Xe16.10.1c
CiscoIos Xe16.10.1d
CiscoIos Xe16.10.1e
CiscoIos Xe16.10.1f
CiscoIos Xe16.10.1g
CiscoIos Xe16.10.1s
CiscoIos Xe16.10.2
CiscoIos Xe16.10.3
CiscoIos Xe16.11.1
CiscoIos Xe16.11.1a
CiscoIos Xe16.11.1b
CiscoIos Xe16.11.1s
CiscoIos Xe16.11.2
CiscoIos Xe16.12.1
CiscoIos Xe16.12.1a
CiscoIos Xe16.12.1c
CiscoIos Xe16.12.1s
CiscoIos Xe16.12.1t
CiscoIos Xe16.12.1w
CiscoIos Xe16.12.1x
CiscoIos Xe16.12.1y
CiscoIos Xe16.12.1z1
CiscoIos Xe16.12.1z2
CiscoIos Xe16.12.2
CiscoIos Xe16.12.2a
CiscoIos Xe16.12.2s

Showing 50 of 96 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-20227?
A vulnerability in the Layer 2 Tunneling Protocol (L2TP) feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of certain L2TP packets. An attacker could exploit this vulnerability by sending crafted L2TP packets to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition. Note: Only traffic directed to the affected system can be used to exploit this vulnerability.
How severe is CVE-2023-20227?
CVE-2023-20227 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.65% probability of exploitation in the next 30 days.
How do I fix CVE-2023-20227?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-20227?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST