CVE-2025-20140
A vulnerability in the Wireless Network Control daemon (wncd) of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an…
- 7.4HighCVSS base score
- 0.25%Exploitation in 30 daysEPSS · top 84% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the Wireless Network Control daemon (wncd) of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) could allow an unauthenticated, adjacent wireless attacker to cause a denial of service (DoS) condition. This vulnerability is due to improper memory management. An attacker could exploit this vulnerability by sending a series of IPv6 network requests from an associated wireless IPv6 client to an affected device. To associate a client to a device, an attacker may first need to authenticate to the network, or associate freely in the case of a configured open network. A successful exploit could allow the attacker to cause the wncd process to consume available memory and eventually cause the device to stop responding, resulting in a DoS condition.
Timeline
ID reserved
By cisco
- 7 months later
· 7 months later
Published
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)
- 0.25% · top 84% of all CVEs (12 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 16.4.1
- affected 16.4.2
- affected 16.4.3
- affected 16.5.1
- affected 16.5.1a
- affected 16.5.1b
- affected 16.5.2
- affected 16.5.3
- affected 16.6.1
- affected 16.6.2
- affected 16.6.3
- affected 16.6.4
- affected 16.6.5
- affected 16.6.4a
- affected 16.6.5a
- affected 16.6.6
- affected 16.6.7
- affected 16.6.8
- affected 16.6.9
- affected 16.6.10
- affected 16.7.1
- affected 16.7.1a
- affected 16.7.1b
- affected 16.7.2
- affected 16.7.3
- affected 16.7.4
- affected 16.8.1
- affected 16.8.1a
- affected 16.8.1b
- affected 16.8.1s
- affected 16.8.1c
- affected 16.8.1d
- affected 16.8.2
- affected 16.8.1e
- affected 16.8.3
- affected 16.9.1
- affected 16.9.2
- affected 16.9.1a
- affected 16.9.1b
- affected 16.9.1s
- and 154 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
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-2025-13886 (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-2025-20140)Record last updated .