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CVE-2024-20303

HIGH
7.4
CVSS Score
Published: March 27, 2024 at 05:00 PM UTC
Updated: June 17, 2026 at 07:06 AM UTC
17 products affected across 1 vendorIOS XeCatalyst 9800-LCatalyst 9800-80

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Severity
HIGH7.4
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xe· Cisco
95%
17.10.117.10.1a17.10.1b17.11.117.11.1a17.11.99SW17.11.99sw17.2.117.2.1a17.2.1r17.2.1v17.2.217.2.317.3.117.3.1a17.3.1w17.3.1x17.3.1z17.3.217.3.2a17.3.317.3.417.3.4a17.3.4b17.3.4c17.3.517.3.5a17.3.5b17.3.617.3.717.3.817.3.8a17.4.117.4.1a17.4.1b17.4.217.4.2a17.5.117.5.1a17.6.117.6.1a17.6.1w17.6.1x17.6.1y17.6.1z17.6.1z117.6.217.6.317.6.3a17.6.417.6.517.6.5a17.7.117.7.1a17.7.1b17.7.217.8.117.8.1a17.9.117.9.1a17.9.1w17.9.1x17.9.1x117.9.1y17.9.1y117.9.217.9.2a17.9.317.9.3a
cisco-catalyst-9105axi (environment) · cisco-catalyst-9115axe (environment) · cisco-catalyst-9115axi (environment) · cisco-catalyst-9117axi (environment) · cisco-catalyst-9120axe (environment) · cisco-catalyst-9120axi (environment) · cisco-catalyst-9120axp (environment) · cisco-catalyst-9130axe (environment) · cisco-catalyst-9130axi (environment) · cisco-catalyst-9800-40 (environment) · cisco-catalyst-9800-80 (environment) · cisco-catalyst-9800-cl-wireless-controllers-for-cloud (environment) · cisco-catalyst-9800-l (environment) · cisco-catalyst-cw9800h1 (environment) · cisco-catalyst-cw9800h2 (environment) · cisco-catalyst-cw9800m (environment)
Catalyst 9105Axi· Ciscodevice
80%
All versions
Catalyst 9115Axe· Ciscodevice
80%
All versions
Catalyst 9115Axi· Ciscodevice
80%
All versions
Catalyst 9117Axi· Ciscodevice
80%
All versions
Catalyst 9120Axe· Ciscodevice
80%
All versions
Catalyst 9120Axi· Ciscodevice
80%
All versions
Catalyst 9120Axp· Ciscodevice
80%
All versions
Catalyst 9130Axe· Ciscodevice
80%
All versions
Catalyst 9130Axi· Ciscodevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-mdns-dos-4hv6pBGf

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHcisco
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-459

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