7.4

CVE-2021-1228: cisco cisco nx-os system software in aci mode 11.0.1b Improper Access Control

CVSS: 7.4v3.1HighModified
Published 24-02-2021Last modified 08-11-2024
Open JSON

Vulnerability summary

CVE-2021-1228 is a high (CVSS 7.4) Improper Access Control vulnerability in cisco cisco nx-os system software in aci mode 11.0.1b. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.39%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-02-2021
    PublishedVulnerability first disclosed.
  2. 08-11-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the fabric infrastructure VLAN connection establishment of Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) Mode could allow an unauthenticated, adjacent attacker to bypass security validations and connect an unauthorized server to the infrastructure VLAN. This vulnerability is due to insufficient security requirements during the Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure VLAN. An attacker could exploit this vulnerability by sending a crafted LLDP packet on the adjacent subnet to an affected device. A successful exploit could allow the attacker to connect an unauthorized server to the infrastructure VLAN, which is highly privileged. With a connection to the infrastructure VLAN, the attacker can make unauthorized connections to Cisco Application Policy Infrastructure Controller (APIC) services or join other host endpoints.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

0.00 pp

From 0.39% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.39%

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

Cisco2 products
  • cisco nx-os system software in aci mode 11.0.1bn/a
  • nx-os11.0\(1b\) | 11.0\(1c\) | 11.0\(1d\) | 11.0\(1e\) | 11.0\(2j\) | 11.0\(2m\) | 11.0\(3f\) | 11.0\(3i\) | 11.0\(3k\) | 11.0\(3n\) | 11.0\(3o\) | 11.0\(4g\) | 11.0\(4h\) | 11.0\(4o\) | 11.0\(4q\) | 11.1\(1j\) | 11.1\(1o\) | 11.1\(1r\) | 11.1\(1s\) | 11.1\(2h\) | 11.1\(2i\) | 11.1\(3f\) | 11.1\(4e\) | 11.1\(4f\) | 11.1\(4g\) | 11.1\(4i\) | 11.1\(4l\) | 11.1\(4m\) | 11.2\(1i\) | 11.2\(1k\) | 11.2\(1m\) | 11.2\(2g\) | 11.2\(2h\) | 11.2\(2i\) | 11.2\(2j\) | 11.2\(3c\) | 11.2\(3e\) | 11.2\(3h\) | 11.2\(3m\) | 11.3\(1g\) | 11.3\(1h\) | 11.3\(1i\) | 11.3\(1j\) | 11.3\(2f\) | 11.3\(2h\) | 11.3\(2i\) | 11.3\(2j\) | 11.3\(2k\) | 12.0\(1m\) | 12.0\(1n\) | 12.0\(1o\) | 12.0\(1p\) | 12.0\(1q\) | 12.0\(1r\) | 12.0\(2f\) | 12.0\(2g\) | 12.0\(2h\) | 12.0\(2l\) | 12.0\(2m\) | 12.0\(2n\) | 12.0\(2o\) | 12.1\(1h\) | 12.1\(1i\) | 12.1\(2e\) | 12.1\(2g\) | 12.1\(2k\) | 12.1\(3g\) | 12.1\(3h\) | 12.1\(3j\) | 12.1\(4a\) | 12.2\(1k\) | 12.2\(1n\) | 12.2\(1o\) | 12.2\(2e\) | 12.2\(2f\) | 12.2\(2i\) | 12.2\(2j\) | 12.2\(2k\) | 12.2\(2q\) | 12.2\(3j\) | 12.2\(3p\) | 12.2\(3r\) | 12.2\(3s\) | 12.2\(3t\) | 12.2\(4f\) | 12.2\(4p\) | 12.2\(4q\) | 12.2\(4r\) | 12.3\(1e\) | 12.3\(1f\) | 12.3\(1i\) | 12.3\(1l\) | 12.3\(1o\) | 12.3\(1p\) | 13.0\(1k\) | 13.0\(2h\) | 13.0\(2k\) | 13.0\(2n\) | 13.1\(1i\) | 13.1\(2m\) | 13.1\(2o\) | 13.1\(2p\) | 13.1\(2q\) | 13.1\(2s\) | 13.1\(2t\) | 13.1\(2u\) | 13.1\(2v\) | 13.2\(1l\) | 13.2\(1m\) | 13.2\(2l\) | 13.2\(2o\) | 13.2\(3i\) | 13.2\(3j\) | 13.2\(3n\) | 13.2\(3o\) | 13.2\(3r\) | 13.2\(3s\) | 13.2\(4d\) | 13.2\(4e\) | 13.2\(5d\) | 13.2\(5e\) | 13.2\(5f\) | 13.2\(6i\) | 13.2\(7f\) | 13.2\(7k\) | 13.2\(8d\) | 13.2\(9b\) | 13.2\(9f\) | 13.2\(9h\) | 13.2\(41d\) | 14.0\(1h\) | 14.0\(2c\) | 14.0\(3c\) | 14.0\(3d\) | 14.1\(1i\) | 14.1\(1j\) | 14.1\(1k\) | 14.1\(1l\) | 14.1\(2g\) | 14.1\(2m\) | 14.1\(2o\) | 14.1\(2s\) | 14.1\(2u\) | 14.1\(2w\) | 14.1\(2x\) | 14.2\(1i\) | 14.2\(1j\) | 14.2\(1l\) | 14.2\(2e\) | 14.2\(2f\) | 14.2\(3j\) | 14.2\(3l\) | 14.2\(3n\) | 14.2\(3q\) | 14.2\(4i\) | 14.2\(4k\) | 14.2\(4o\) | 14.2\(4p\) | 14.2\(5k\) | 15.0\(1k\) | 15.0\(1l\) | 15.0\(2h\)

1 vendor · 2 products

References

1 links