9.8

CVE-2026-20212: cisco cisco nx-os software Binding to an Unrestricted IP Address

CVSS: 9.8v3.1CriticalAwaiting analysis
Published 02-09-2026Last modified 03-09-2026
Open JSON

Vulnerability summary

CVE-2026-20212 is a critical (CVSS 9.8) Binding to an Unrestricted IP Address vulnerability in cisco cisco nx-os software. EPSS estimates a 0.72% chance of exploitation in the next 30 days, higher than 53.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.72%
0%100%
Low · +0.19 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 02-09-2026
    PublishedVulnerability first disclosed.
  2. 03-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.72%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

+0.19 pp

From 0.53% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.72%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco1 product
  • cisco nx-os software10.3(1) | 10.3(2) | 10.3(3) | 10.4(1) | 10.3(99w) | 10.3(3w) | 10.3(99x) | 10.3(3o) | 10.3(4) | 10.3(3p) | 10.3(4a) | 10.4(2) | 10.3(3q) | 10.3(5) | 10.4(3) | 10.3(3x) | 10.3(4g) | 10.5(1) | 10.3(3r) | 10.3(6) | 10.4(4) | 10.3(4h) | 10.5(2) | 10.3(7) | 10.4(5) | 10.5(3) | 10.4(4g) | 10.5(4) | 10.6(1) | 10.5(3t) | 10.3(8) | 10.4(6) | 10.5(3s) | 10.5(3e) | 10.5(3o) | 10.6(1s) | 10.6(2) | 10.5(3p) | 10.3(9) | 10.6(2s) | 10.6(3) | 10.4(7) | 10.5(5) | 10.6(2n) | 10.6(3s)

1 vendor · 1 product

References

1 links