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CVE-2021-1451

CRITICALCVSS 9.8/10EPSS 3.21%

Last modified

CVE-2021-1451 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A vulnerability in the Easy Virtual Switching System (VSS) feature of Cisco IOS XE Software for Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying Linux operating system of an affected device. The vulnerability is due to incorrect boundary checks of certain values in Easy VSS protocol packets that are destined for an affected device. EPSS estimates a 3.21% chance of exploitation in the next 30 days.

Description

A vulnerability in the Easy Virtual Switching System (VSS) feature of Cisco IOS XE Software for Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying Linux operating system of an affected device. The vulnerability is due to incorrect boundary checks of certain values in Easy VSS protocol packets that are destined for an affected device. An attacker could exploit this vulnerability by sending crafted Easy VSS protocol packets to UDP port 5500 while the affected device is in a specific state. When the crafted packet is processed, a buffer overflow condition may occur. A successful exploit could allow the attacker to trigger a denial of service (DoS) condition or execute arbitrary code with root privileges on the underlying Linux operating system of the affected device.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
3.21%

86.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xe3.6.0be
CiscoIos Xe3.6.0e
CiscoIos Xe3.6.1e
CiscoIos Xe3.6.2e
CiscoIos Xe3.6.3e
CiscoIos Xe3.6.4e
CiscoIos Xe3.6.5ae
CiscoIos Xe3.6.5be
CiscoIos Xe3.6.5e
CiscoIos Xe3.6.6e
CiscoIos Xe3.6.7e
CiscoIos Xe3.6.8e
CiscoIos Xe3.6.9e
CiscoIos Xe3.6.10e
CiscoIos Xe3.7.0e
CiscoIos Xe3.7.1e
CiscoIos Xe3.7.2e
CiscoIos Xe3.7.3e
CiscoIos Xe3.7.4e
CiscoIos Xe3.7.5e
CiscoIos Xe3.8.0e
CiscoIos Xe3.8.1e
CiscoIos Xe3.8.2e
CiscoIos Xe3.8.3e
CiscoIos Xe3.8.4e
CiscoIos Xe3.8.5ae
CiscoIos Xe3.8.5e
CiscoIos Xe3.8.6e
CiscoIos Xe3.8.7e
CiscoIos Xe3.8.8e
CiscoIos Xe3.8.9e
CiscoIos Xe3.8.10e
CiscoIos Xe3.9.0e
CiscoIos Xe3.9.1e
CiscoIos Xe3.9.2be
CiscoIos Xe3.9.2e
CiscoIos Xe3.10.0ce
CiscoIos Xe3.10.0e
CiscoIos Xe3.10.1ae
CiscoIos Xe3.10.1e
CiscoIos Xe3.10.1se
CiscoIos Xe3.10.2e
CiscoIos Xe3.10.3e
CiscoIos Xe3.11.0e
CiscoIos Xe3.11.1ae
CiscoIos Xe3.11.1e
CiscoIos Xe3.11.2ae
CiscoIos Xe3.11.2e
CiscoIos Xe3.11.3ae
CiscoIos Xe3.11.3e

Showing 50 of 54 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-1451?
A vulnerability in the Easy Virtual Switching System (VSS) feature of Cisco IOS XE Software for Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to execute arbitrary code on the underlying Linux operating system of an affected device. The vulnerability is due to incorrect boundary checks of certain values in Easy VSS protocol packets that are destined for an affected device. An attacker could exploit this vulnerability by sending crafted Easy VSS protocol packets to UDP port 5500 while the affected device is in a specific state. When the crafted packet is processed, a buffer overflow condition may occur. A successful exploit could allow the attacker to trigger a denial of service (DoS) condition or execute arbitrary code with root privileges on the underlying Linux operating system of the affected device.
How severe is CVE-2021-1451?
CVE-2021-1451 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.21% probability of exploitation in the next 30 days.
How do I fix CVE-2021-1451?
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-2021-1451?

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

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Source: NVD / NIST