# CVE-2021-1677: Azure Active Directory Pod Identity Spoofing Vulnerability

> Attackers can spoof Azure AD Pod Identity to gain unauthorized access and escalate privileges within Azure Kubernetes Service clusters.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Jan 2021
- **Updated:** 19 Nov 2024
- **Also known as:** GHSA-jr8j-fh83-j7h4

## What is CVE-2021-1677?

CVE-2021-1677 is a medium-severity authentication bypass vulnerability in Microsoft Azure Kubernetes Service, published on 12 Jan 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Azure Active Directory Pod Identity Spoofing Vulnerability

Weakness: CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2021-1677?

It affects 1 product.


Products: Microsoft Azure Kubernetes Service.

## How do I fix CVE-2021-1677?

No fix has been published for CVE-2021-1677 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1677 being exploited?

There is no known exploitation of CVE-2021-1677 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Azure Kubernetes Service

- [CVE-2026-56163](https://insights.sbomify.com/CVE-2026-56163/): Microsoft Azure Kubernetes Service Elevation of Privilege Vulnerability (critical 10.0)
- [CVE-2026-33105](https://insights.sbomify.com/CVE-2026-33105/): Microsoft Azure Kubernetes Service Elevation of Privilege Vulnerability (critical 10.0)
- [CVE-2026-50516](https://insights.sbomify.com/CVE-2026-50516/): Microsoft Azure Kubernetes Service Elevation of Privilege Vulnerability (critical 9.4)
- [CVE-2024-21376](https://insights.sbomify.com/CVE-2024-21376/): Microsoft Azure Kubernetes Service Confidential Container Remote Code Execution Vulnerability (critical 9.0)
- [CVE-2024-21403](https://insights.sbomify.com/CVE-2024-21403/): Microsoft Azure Kubernetes Service Confidential Container Elevation of Privilege Vulnerability (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1677 and fix it if it is affected.

What it is: CVE-2021-1677 is a medium-severity authentication bypass vulnerability in Microsoft Azure Kubernetes Service, published on 12 Jan 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-1677 in the wild and no public exploit code.

Affected product: Microsoft Azure Kubernetes Service. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-1677/ (Markdown: https://insights.sbomify.com/CVE-2021-1677/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1677
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1677
- OSV: https://osv.dev/vulnerability/CVE-2021-1677

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-1677/
Summaries are generated and may contain mistakes; the official description above is the record.