CVE-2025-20111Cisco Nexus 3000 and 9000 Series Switches Layer 2 Ethernet Denial of Service Vulnerability
- 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 health monitoring diagnostics of Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of specific Ethernet frames. An attacker could exploit this vulnerability by sending a sustained rate of crafted Ethernet frames to an affected device. A successful exploit could allow the attacker to cause the device to reload.
Timeline
ID reserved
By cisco
- 5 months later
· 5 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 · Deferred | 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 (14 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 9.3(2)
- affected 9.3(1)
- affected 9.3(1z)
- affected 9.3(3)
- affected 9.3(4)
- affected 9.3(5)
- affected 9.3(6)
- affected 10.1(2)
- affected 10.1(1)
- affected 9.3(5w)
- affected 9.3(7)
- affected 9.3(7k)
- affected 10.2(1)
- affected 9.3(7a)
- affected 9.3(8)
- affected 10.2(1q)
- affected 10.2(2)
- affected 9.3(9)
- affected 10.1(2t)
- affected 10.2(3)
- affected 10.2(3t)
- affected 9.3(10)
- affected 10.2(2a)
- affected 10.3(1)
- affected 10.2(4)
- affected 10.3(2)
- affected 9.3(11)
- affected 10.3(3)
- affected 10.2(5)
- affected 9.3(12)
- affected 10.2(3v)
- affected 10.4(1)
- affected 10.3(99w)
- affected 10.2(6)
- affected 10.3(3w)
- affected 10.3(99x)
- affected 10.3(3o)
- affected 10.3(4)
- affected 10.3(3p)
- affected 10.3(4a)
- and 13 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-2025-5297 (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-2025-20111)Record last updated .