- 5.8MediumCVSS base score
- 0.37%Exploitation in 30 daysEPSS · top 68% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in Cisco NX-OS Software could allow an unauthenticated, remote attacker to exhaust system resources, causing a denial of service (DoS) condition. This vulnerability exists because rate limiting was improperly applied to some protocols. An attacker could exploit this vulnerability by sending a high rate of UDP or TCP connections to a data plane interface on an affected device. A successful exploit could allow the attacker to cause instability to various routing and control plane protocols through some packet loss and temporary disruptions, causing a DoS condition. This DoS condition will clear without manual intervention soon after the high rate of traffic is stopped.
Timeline
ID reserved
By cisco
- 12 months later
· 12 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 | Medium5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L |
| NVDNVD · Awaiting Analysis | 3.1 | Medium5.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.37% · top 68% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.
Affected products
- affected 8.2(5)
- affected 7.3(5)D1(1)
- affected 8.4(2)
- affected 8.4(3)
- affected 9.2(3)
- affected 9.2(2v)
- affected 7.3(4)D1(1)
- affected 8.2(1)
- affected 9.2(1)
- affected 9.2(2t)
- affected 9.2(3y)
- affected 9.3(2)
- affected 8.1(1)
- affected 8.2(2)
- affected 8.3(2)
- affected 7.3(2)D1(3a)
- affected 9.2(4)
- affected 8.1(2)
- affected 7.3(3)D1(1)
- affected 8.2(3)
- affected 8.4(1)
- affected 7.3(0)DX(1)
- affected 7.3(2)D1(1)
- affected 9.3(1)
- affected 7.3(2)D1(2)
- affected 8.2(4)
- affected 9.3(1z)
- affected 9.2(2)
- affected 8.1(2a)
- affected 7.3(2)D1(3)
- affected 8.3(1)
- affected 7.3(1)D1(1)
- affected 7.3(0)D1(1)
- affected 9.3(3)
- affected 7.3(2)D1(1d)
- affected 9.3(4)
- affected 7.3(6)D1(1)
- affected 8.2(6)
- affected 9.3(5)
- affected 9.3(6)
- and 71 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-2026-94449 (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-2026-20173)Record last updated .