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CVE-2023-20027

HIGHCVSS 8.6/10EPSS 0.98%

Last modified

CVE-2023-20027 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) 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 reassembly of large packets that occurs when VFR is enabled on either a tunnel interface or on a physical interface that is configured with a maximum transmission unit (MTU) greater than 4,615 bytes. EPSS estimates a 0.98% chance of exploitation in the next 30 days.

Description

A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) 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 reassembly of large packets that occurs when VFR is enabled on either a tunnel interface or on a physical interface that is configured with a maximum transmission unit (MTU) greater than 4,615 bytes. An attacker could exploit this vulnerability by sending fragmented packets through a VFR-enabled interface on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Metrics

CVSS 3.1
8.6/10

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

EPSS Probability
0.98%

57.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xe3.9.0as
CiscoIos Xe3.9.1s
CiscoIos Xe3.9.2s
CiscoIos Xe3.10.0s
CiscoIos Xe3.10.1s
CiscoIos Xe3.10.2as
CiscoIos Xe3.10.2s
CiscoIos Xe3.10.2ts
CiscoIos Xe3.10.3s
CiscoIos Xe3.10.4s
CiscoIos Xe3.10.5s
CiscoIos Xe3.10.6s
CiscoIos Xe3.10.7s
CiscoIos Xe3.10.8as
CiscoIos Xe3.10.8s
CiscoIos Xe3.10.9s
CiscoIos Xe3.10.10s
CiscoIos Xe3.11.0s
CiscoIos Xe3.11.1s
CiscoIos Xe3.11.2s
CiscoIos Xe3.11.3s
CiscoIos Xe3.11.4s
CiscoIos Xe3.12.0s
CiscoIos Xe3.12.1s
CiscoIos Xe3.12.2s
CiscoIos Xe3.12.3s
CiscoIos Xe3.12.4s
CiscoIos Xe3.13.0s
CiscoIos Xe3.13.1s
CiscoIos Xe3.13.2s
CiscoIos Xe3.13.3s
CiscoIos Xe3.13.4s
CiscoIos Xe3.13.5s
CiscoIos Xe3.13.6as
CiscoIos Xe3.13.6s
CiscoIos Xe3.13.7s
CiscoIos Xe3.13.8s
CiscoIos Xe3.13.9s
CiscoIos Xe3.13.10s
CiscoIos Xe3.14.0s
CiscoIos Xe3.14.1s
CiscoIos Xe3.14.2s
CiscoIos Xe3.14.3s
CiscoIos Xe3.14.4s
CiscoIos Xe3.15.0s
CiscoIos Xe3.15.1cs
CiscoIos Xe3.15.1s
CiscoIos Xe3.15.2s
CiscoIos Xe3.15.3s
CiscoIos Xe3.15.4s

Showing 50 of 190 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-20027?
A vulnerability in the implementation of the IPv4 Virtual Fragmentation Reassembly (VFR) 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 reassembly of large packets that occurs when VFR is enabled on either a tunnel interface or on a physical interface that is configured with a maximum transmission unit (MTU) greater than 4,615 bytes. An attacker could exploit this vulnerability by sending fragmented packets through a VFR-enabled interface on an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
How severe is CVE-2023-20027?
CVE-2023-20027 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 0.98% probability of exploitation in the next 30 days.
How do I fix CVE-2023-20027?
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-2023-20027?

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

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Source: NVD / NIST