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CVE-2026-20212

Cisco Nexus 3000 and 9000 Series Switches Silicon One Hardware Abstraction Layer Remote Code Execution Vulnerability

Critical9.8EPSS 0.83%
Published
Updated
Reserved
Assigned by
cisco

Description

A vulnerability in the Silicon One integration for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to execute code with root privileges. This vulnerability exists because TCP ports 43210 and 43211 are accessible in the default Layer 3 (L3) virtual routing and forwarding (VRF). A successful exploit could allow the attacker to connect to an affected device and send crafted input that could be executed as code with root privileges. The exploitation of this vulnerability could also cause the S1HAL process to crash, which could cause the device to reload.

Timeline

  1. ID reserved

    By cisco

  2. · 11 months later

    Published

  3. · 1 day 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

CVSS scores of CVE-2026-20212, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Awaiting Analysis3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.83% · top 42% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

Affected products

  • Cisco · Cisco NX-OS Software

    • affected 10.3(1)
    • affected 10.3(2)
    • affected 10.3(3)
    • affected 10.4(1)
    • affected 10.3(99w)
    • affected 10.3(3w)
    • affected 10.3(99x)
    • affected 10.3(3o)
    • affected 10.3(4)
    • affected 10.3(3p)
    • affected 10.3(4a)
    • affected 10.4(2)
    • affected 10.3(3q)
    • affected 10.3(5)
    • affected 10.4(3)
    • affected 10.3(3x)
    • affected 10.3(4g)
    • affected 10.5(1)
    • affected 10.3(3r)
    • affected 10.3(6)
    • affected 10.4(4)
    • affected 10.3(4h)
    • affected 10.5(2)
    • affected 10.3(7)
    • affected 10.4(5)
    • affected 10.5(3)
    • affected 10.4(4g)
    • affected 10.5(4)
    • affected 10.6(1)
    • affected 10.5(3t)
    • affected 10.3(8)
    • affected 10.4(6)
    • affected 10.5(3s)
    • affected 10.5(3e)
    • affected 10.5(3o)
    • affected 10.6(1s)
    • affected 10.6(2)
    • affected 10.5(3p)
    • affected 10.3(9)
    • affected 10.6(2s)
    • and 5 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 (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-20212 badge
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Record last updated .