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CVE-2021-34770

CRITICALCVSS 9.8/10EPSS 2.87%

Last modified

CVE-2021-34770 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, remote attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a logic error that occurs during the validation of CAPWAP packets. EPSS estimates a 2.87% chance of exploitation in the next 30 days.

Description

A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, remote attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a logic error that occurs during the validation of CAPWAP packets. An attacker could exploit this vulnerability by sending a crafted CAPWAP packet to an affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the affected device to crash and reload, resulting in a DoS condition.

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
2.87%

85.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos XeAll versions
CiscoIos Xe3.15.1xbs
CiscoIos Xe3.15.2xbs
CiscoIos Xe16.6.4s
CiscoIos Xe16.10.1
CiscoIos Xe16.10.1e
CiscoIos Xe16.10.1s
CiscoIos Xe16.11.1
CiscoIos Xe16.11.1a
CiscoIos Xe16.11.1b
CiscoIos Xe16.11.1c
CiscoIos Xe16.11.2
CiscoIos Xe16.12.1
CiscoIos Xe16.12.1s
CiscoIos Xe16.12.1t
CiscoIos Xe16.12.2s
CiscoIos Xe16.12.2t
CiscoIos Xe16.12.3
CiscoIos Xe16.12.3s
CiscoIos Xe16.12.4
CiscoIos Xe16.12.4a
CiscoIos Xe17.1.1
CiscoIos Xe17.1.1s
CiscoIos Xe17.1.1t
CiscoIos Xe17.1.2
CiscoIos Xe17.1.3
CiscoIos Xe17.2.1
CiscoIos Xe17.2.1a
CiscoIos Xe17.3.1

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2021-34770?
A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, remote attacker to execute arbitrary code with administrative privileges or cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a logic error that occurs during the validation of CAPWAP packets. An attacker could exploit this vulnerability by sending a crafted CAPWAP packet to an affected device. A successful exploit could allow the attacker to execute arbitrary code with administrative privileges or cause the affected device to crash and reload, resulting in a DoS condition.
How severe is CVE-2021-34770?
CVE-2021-34770 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.87% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34770?
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-2021-34770?

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

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Source: NVD / NIST