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CVE-2024-20303

HIGHCVSS 7.4/10EPSS 0.32%

Last modified

CVE-2024-20303 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper management of mDNS client entries. An attacker could exploit this vulnerability by connecting to the wireless network and sending a continuous stream of specific mDNS packets. EPSS estimates a 0.32% chance of exploitation in the next 30 days.

Description

A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper management of mDNS client entries. An attacker could exploit this vulnerability by connecting to the wireless network and sending a continuous stream of specific mDNS packets. A successful exploit could allow the attacker to cause the wireless controller to have high CPU utilization, which could lead to access points (APs) losing their connection to the controller and result in a DoS condition.

Metrics

CVSS 3.1
7.4/10

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

EPSS Probability
0.32%

23.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoIos Xe17.2.1
CiscoIos Xe17.2.1a
CiscoIos Xe17.2.1r
CiscoIos Xe17.2.1v
CiscoIos Xe17.2.2
CiscoIos Xe17.2.3
CiscoIos Xe17.3.1
CiscoIos Xe17.3.1a
CiscoIos Xe17.3.1w
CiscoIos Xe17.3.1x
CiscoIos Xe17.3.1z
CiscoIos Xe17.3.2
CiscoIos Xe17.3.2a
CiscoIos Xe17.3.3
CiscoIos Xe17.3.4
CiscoIos Xe17.3.4a
CiscoIos Xe17.3.4b
CiscoIos Xe17.3.4c
CiscoIos Xe17.3.5
CiscoIos Xe17.3.5a
CiscoIos Xe17.3.5b
CiscoIos Xe17.3.6
CiscoIos Xe17.3.7
CiscoIos Xe17.3.8
CiscoIos Xe17.3.8a
CiscoIos Xe17.4.1
CiscoIos Xe17.4.1a
CiscoIos Xe17.4.1b
CiscoIos Xe17.4.2
CiscoIos Xe17.4.2a
CiscoIos Xe17.5.1
CiscoIos Xe17.5.1a
CiscoIos Xe17.6.1
CiscoIos Xe17.6.1a
CiscoIos Xe17.6.1w
CiscoIos Xe17.6.1x
CiscoIos Xe17.6.1y
CiscoIos Xe17.6.1z
CiscoIos Xe17.6.1z1
CiscoIos Xe17.6.2
CiscoIos Xe17.6.3
CiscoIos Xe17.6.3a
CiscoIos Xe17.6.4
CiscoIos Xe17.6.5
CiscoIos Xe17.6.5a
CiscoIos Xe17.7.1
CiscoIos Xe17.7.1a
CiscoIos Xe17.7.1b
CiscoIos Xe17.7.2
CiscoIos Xe17.8.1

Showing 50 of 68 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2024-20303?
A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper management of mDNS client entries. An attacker could exploit this vulnerability by connecting to the wireless network and sending a continuous stream of specific mDNS packets. A successful exploit could allow the attacker to cause the wireless controller to have high CPU utilization, which could lead to access points (APs) losing their connection to the controller and result in a DoS condition.
How severe is CVE-2024-20303?
CVE-2024-20303 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.32% probability of exploitation in the next 30 days.
How do I fix CVE-2024-20303?
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-2024-20303?

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

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Source: NVD / NIST