CVE-2021-1227

What it is

A vulnerability in the NX-API feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack on an affected system. This vulnerability is due to insufficient CSRF protections for the NX-API on an affected device. An attacker could exploit this vulnerability by persuading a user of the NX-API to follow a malicious link. A successful exploit could allow the attacker to perform arbitrary actions with the privilege level of the affected user. The attacker could view and modify the device configuration. Note: The NX-API feature is disabled by default.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure, data tampering.

Exploit odds

0.7% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-02-24 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:31 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.7% in the next 30 days (EPSS).
• Severity: 8.1 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-02-24 20:15 UTC

Last modified

2026-06-17 03:31 UTC

Exploit probability

0.7% · EPSS, next 30 days

Weakness

CWE-352 · Cross-site request forgery

Record status

Modified

Affected

• Cisco nx-os 8.4\(2a\)
• Cisco nx-os 8.4\(3\)
• Cisco nx-os 8.4\(3\)s19
• Cisco nx-os 9.3\(3\)idi9\(0.569\)
• Cisco nx-os 7.3\(8\)n1\(0.809\)

Attack profile CVSS 3.1 · 8.1

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-1227.md and follow it. Check whether this project is affected by CVE-2021-1227. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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