# CVE-2021-1601: Cisco Intersight Virtual Appliance IPv4 and IPv6 Forwarding Vulnerabilities

> Unauthenticated adjacent attackers can access sensitive internal services and modify configurations on Cisco Intersight Virtual Appliances due to insufficient network restrictions.

- **Severity:** High 8.3 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Jul 2021
- **Updated:** 7 Nov 2024
- **Also known as:** GHSA-fxvh-v448-8246

## What is CVE-2021-1601?

CVE-2021-1601 is a high-severity missing authorization vulnerability in Cisco Intersight Virtual Appliance, published on 22 Jul 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Multiple vulnerabilities in Cisco Intersight Virtual Appliance could allow an unauthenticated, adjacent attacker to access sensitive internal services from an external interface. These vulnerabilities are due to insufficient restrictions for IPv4 or IPv6 packets that are received on the external management interface. An attacker could exploit these vulnerabilities by sending specific traffic to this interface on an affected device. A successful exploit could allow the attacker to access sensitive internal services and make configuration changes on the affected device.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2021-1601?

It affects 1 product.


Products: Cisco Intersight Virtual Appliance.

## How do I fix CVE-2021-1601?

No fix has been published for CVE-2021-1601 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1601 being exploited?

There is no known exploitation of CVE-2021-1601 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Intersight Virtual Appliance

- [CVE-2021-34748](https://insights.sbomify.com/CVE-2021-34748/): Cisco Intersight Virtual Appliance Command Injection Vulnerability (high 8.8)
- [CVE-2021-1600](https://insights.sbomify.com/CVE-2021-1600/): Cisco Intersight Virtual Appliance IPv4 and IPv6 Forwarding Vulnerabilities (high 8.3)
- [CVE-2021-1617](https://insights.sbomify.com/CVE-2021-1617/): Cisco Intersight Virtual Appliance Vulnerabilities (medium 6.5)
- [CVE-2021-1618](https://insights.sbomify.com/CVE-2021-1618/): Cisco Intersight Virtual Appliance Vulnerabilities (medium 6.5)
- [CVE-2023-20237](https://insights.sbomify.com/CVE-2023-20237/): Server-side request forgery in Cisco Intersight Virtual Appliance (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1601 and fix it if it is affected.

What it is: CVE-2021-1601 is a high-severity missing authorization vulnerability in Cisco Intersight Virtual Appliance, published on 22 Jul 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-2021-1601 in the wild and no public exploit code.

Affected product: Cisco Intersight Virtual Appliance. 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-2021-1601/ (Markdown: https://insights.sbomify.com/CVE-2021-1601/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1601
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1601
- OSV: https://osv.dev/vulnerability/CVE-2021-1601

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1601/
Summaries are generated and may contain mistakes; the official description above is the record.