# CVE-2020-3473: Cisco IOS XR Software Authenticated User Privilege Escalation Vulnerability

> An authenticated local user can exploit incorrect task group mapping in Cisco IOS XR to gain full administrative control of the device.

- **Severity:** High 7.8 (`CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **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:** 4 Sep 2020
- **Updated:** 13 Nov 2024
- **Also known as:** GHSA-x8v9-c427-8x6q

## What is CVE-2020-3473?

CVE-2020-3473 is a high-severity vulnerability in Cisco Ios Xr, published on 4 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local CLI shell user to elevate privileges and gain full administrative control of the device. The vulnerability is due to incorrect mapping of a command to task groups within the source code. An attacker could exploit this vulnerability by first authenticating to the local CLI shell on the device and using the CLI command to bypass the task group–based checks. A successful exploit could allow the attacker to elevate privileges and perform actions on the device without authorization checks.

Weakness: CWE-863 (Incorrect Authorization), CWE-264

## Which versions are affected by CVE-2020-3473?

It affects 1 product.


Products: Cisco Ios Xr.

## How do I fix CVE-2020-3473?

No fix has been published for CVE-2020-3473 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-3473 being exploited?

There is no known exploitation of CVE-2020-3473 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios Xr

- [CVE-2020-3118](https://insights.sbomify.com/CVE-2020-3118/): Cisco IOS XR Software Discovery Protocol Format String (high 8.8, exploited in the wild)
- [CVE-2020-3569](https://insights.sbomify.com/CVE-2020-3569/): Cisco IOS XR Software DVMRP Memory Exhaustion (high 8.6, exploited in the wild)
- [CVE-2020-3566](https://insights.sbomify.com/CVE-2020-3566/): Cisco IOS XR Software DVMRP Memory Exhaustion (high 8.6, exploited in the wild)
- [CVE-2010-3035](https://insights.sbomify.com/CVE-2010-3035/): Cisco IOS XR Border Gateway Protocol (BGP) Denial-of-Service (high 7.5, exploited in the wild)
- [CVE-2022-20821](https://insights.sbomify.com/CVE-2022-20821/): Cisco IOS XR Open Port (medium 6.5, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-3473 and fix it if it is affected.

What it is: CVE-2020-3473 is a high-severity vulnerability in Cisco Ios Xr, published on 4 Sep 2020. 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-2020-3473 in the wild and no public exploit code.

Affected product: Cisco Ios Xr. 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-2020-3473/ (Markdown: https://insights.sbomify.com/CVE-2020-3473/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-3473
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-3473
- OSV: https://osv.dev/vulnerability/CVE-2020-3473

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-3473/
Summaries are generated and may contain mistakes; the official description above is the record.