NVD

CVE-2024-20303 Detail

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

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: Cisco Systems, Inc.

Base Score: 7.4 HIGH

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-mdns-dos-4hv6pBGf	CVE, Cisco Systems, Inc.	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-459	Incomplete Cleanup	Cisco Systems, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

CVE Modified by Cisco Systems, Inc. 6/17/2026 3:06:19 AM

Action

Type

Old Value

New Value

Added

Affected

Record truncated, showing 2048 of 2907 characters.
View Entire Change Record

[{"vendor":"Cisco","product":"Cisco IOS XE Software","versions":[{"version":"17.2.1","status":"affected"},{"version":"17.2.1r","status":"affected"},{"version":"17.2.1a","status":"affected"},{"version":"17.2.1v","status":"affected"},{"version":"17.2.2","status":"affected"},{"version":"17.2.3","status":"affected"},{"version":"17.3.1","status":"affected"},{"version":"17.3.2","status":"affected"},{"version":"17.3.3","status":"affected"},{"version":"17.3.1a","status":"affected"},{"version":"17.3.1w","status":"affected"},{"version":"17.3.2a","status":"affected"},{"version":"17.3.1x","status":"affected"},{"version":"17.3.1z","status":"affected"},{"version":"17.3.4","status":"affected"},{"version":"17.3.5","status":"affected"},{"version":"17.3.4a","status":"affected"},{"version":"17.3.6","status":"affected"},{"version":"17.3.4b","status":"affected"},{"version":"17.3.4c","status":"affected"},{"version":"17.3.5a","status":"affected"},{"version":"17.3.5b","status":"affected"},{"version":"17.3.7","status":"affected"},{"version":"17.3.8","status":"affected"},{"version":"17.3.8a","status":"affected"},{"version":"17.4.1","status":"affected"},{"version":"17.4.2","status":"affected"},{"version":"17.4.1a","status":"affected"},{"version":"17.4.1b","status":"affected"},{"version":"17.4.2a","status":"affected"},{"version":"17.5.1","status":"affected"},{"version":"17.5.1a","status":"affected"},{"version":"17.6.1","status":"affected"},{"version":"17.6.2","status":"affected"},{"version":"17.6.1w","status":"affected"},{"version":"17.6.1a","status":"affected"},{"version":"17.6.1x","status":"affected"},{"version":"17.6.3","status":"affected"},{"version":"17.6.1y","status":"affected"},{"version":"17.6.1z","status":"affected"},{"version":"17.6.3a","status":"affected"},{"version":"17.6.4","status":"affected"},{"version":"17.6.1z1","status":"affected"},{"version":"17.6.5","status":"affected"},{"version":"17.6.5a","status":"affected"},{"version":"17.7.1","status":"affected"},{"version":"17.7.1a","status":"affected"},{"version":"17.7.1b","status

Initial Analysis by NIST 7/31/2025 12:56:36 PM

Action

Type

Old Value

New Value

Added

CPE Configuration

Record truncated, showing 2048 of 4787 characters.
View Entire Change Record

AND
     OR
          *cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.4.1:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.3:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.1a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.1w:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.1z:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.4.1a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.4.1b:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.5.1:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.4:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.5:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.4a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.6:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.4b:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.4c:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.3.5a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.4.2:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.4.2a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.5.1a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.6.1:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.6.2:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.6.1w:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.6.1a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.6.3:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.6.3a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.7.1:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17.7.1a:*:*:*:*:*:*:*
          *cpe:2.3:o:cisco:ios_xe:17

Added

Reference Type

CVE: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-mdns-dos-4hv6pBGf Types: Vendor Advisory

Added

Reference Type

Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-mdns-dos-4hv6pBGf Types: Vendor Advisory

New CVE Received from Cisco Systems, Inc. 3/27/2024 1:15:51 PM

Action	Type	New Value
Added	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.
Added	CVSS V3.1	Cisco Systems, Inc. AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Added	CWE	Cisco Systems, Inc. CWE-459
Added	Reference	Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-mdns-dos-4hv6pBGf [No types assigned]

Quick Info

CVE Dictionary Entry:
CVE-2024-20303
NVD Published Date:
03/27/2024
NVD Last Modified:
06/17/2026
Source:
Cisco Systems, Inc.

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2024-20303 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by CISA-ADP 6/17/2026 3:06:19 AM

CVE Modified by Cisco Systems, Inc. 6/17/2026 3:06:19 AM

Initial Analysis by NIST 7/31/2025 12:56:36 PM

CVE Modified by CVE 11/21/2024 3:52:18 AM

CVE Modified by Cisco Systems, Inc. 5/14/2024 10:50:50 AM

New CVE Received from Cisco Systems, Inc. 3/27/2024 1:15:51 PM

Quick Info