# CVE-2018-15371: Cisco IOS XE Software Shell Access Authentication Bypass Vulnerability

> An authenticated local attacker can bypass authentication to gain root shell access on Cisco IOS XE devices if the shell access feature is enabled.

- **Severity:** Medium 6.7 (`CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Oct 2018
- **Updated:** 26 Nov 2024
- **Also known as:** GHSA-6q3f-rc7g-jc2x

## What is CVE-2018-15371?

CVE-2018-15371 is a medium-severity authentication bypass vulnerability in Cisco Ios Xe, published on 5 Oct 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the shell access request mechanism of Cisco IOS XE Software could allow an authenticated, local attacker to bypass authentication and gain unrestricted access to the root shell of an affected device. The vulnerability exists because the affected software has insufficient authentication mechanisms for certain commands. An attacker could exploit this vulnerability by requesting access to the root shell of an affected device, after the shell access feature has been enabled. A successful exploit could allow the attacker to bypass authentication and gain unrestricted access to the root shell of the affected device.

Weakness: CWE-287 (Improper Authentication), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2018-15371?

It affects 1 product.


Products: Cisco Ios Xe.

## How do I fix CVE-2018-15371?

No fix has been published for CVE-2018-15371 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-15371 being exploited?

There is no known exploitation of CVE-2018-15371 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Ios Xe

- [CVE-2023-20198](https://insights.sbomify.com/CVE-2023-20198/): Cisco IOS XE Web UI Privilege Escalation (critical 10.0, exploited in the wild)
- [CVE-2018-0151](https://insights.sbomify.com/CVE-2018-0151/): Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2023-20273](https://insights.sbomify.com/CVE-2023-20273/): Cisco IOS XE Web UI Command Injection (high 7.2, exploited in the wild)
- [CVE-2025-20188](https://insights.sbomify.com/CVE-2025-20188/): Hardcoded credentials in Cisco IOS XE Software (critical 10.0)
- [CVE-2021-34770](https://insights.sbomify.com/CVE-2021-34770/): Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-15371 and fix it if it is affected.

What it is: CVE-2018-15371 is a medium-severity authentication bypass vulnerability in Cisco Ios Xe, published on 5 Oct 2018. 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-2018-15371 in the wild and no public exploit code.

Affected product: Cisco Ios Xe. 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-2018-15371/ (Markdown: https://insights.sbomify.com/CVE-2018-15371/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-15371
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-15371
- OSV: https://osv.dev/vulnerability/CVE-2018-15371

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-15371/
Summaries are generated and may contain mistakes; the official description above is the record.