CVE-2024-20303A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an…
- 7.4HighCVSS base score
- 0.32%Exploitation in 30 daysEPSS · top 74% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By cisco
- 5 months later
· 5 months later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High7.4 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.32% · top 74% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.4.
Affected products
- affected 17.2.1
- affected 17.2.1r
- affected 17.2.1a
- affected 17.2.1v
- affected 17.2.2
- affected 17.2.3
- affected 17.3.1
- affected 17.3.2
- affected 17.3.3
- affected 17.3.1a
- affected 17.3.1w
- affected 17.3.2a
- affected 17.3.1x
- affected 17.3.1z
- affected 17.3.4
- affected 17.3.5
- affected 17.3.4a
- affected 17.3.6
- affected 17.3.4b
- affected 17.3.4c
- affected 17.3.5a
- affected 17.3.5b
- affected 17.3.7
- affected 17.3.8
- affected 17.3.8a
- affected 17.4.1
- affected 17.4.2
- affected 17.4.1a
- affected 17.4.1b
- affected 17.4.2a
- affected 17.5.1
- affected 17.5.1a
- affected 17.6.1
- affected 17.6.2
- affected 17.6.1w
- affected 17.6.1a
- affected 17.6.1x
- affected 17.6.3
- affected 17.6.1y
- affected 17.6.1z
- and 28 more
What to do
Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
References
References1
- cisco-sa-wlc-mdns-dos-4hv6pBGf (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-18018 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-20303)Record last updated .