# CVE-2021-1406: Cisco Unified Communications Manager Information Disclosure Vulnerability

> Authenticated attackers with elevated privileges can access sensitive hashed credentials via downloadable files in Cisco Unified Communications Manager.

- **Severity:** Medium 4.9 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Apr 2021
- **Updated:** 8 Nov 2024
- **Also known as:** GHSA-495g-cj2m-hr56

## What is CVE-2021-1406?

CVE-2021-1406 is a medium-severity vulnerability in Cisco Unified Communications Manager, published on 8 Apr 2021. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to access sensitive information on an affected device. The vulnerability is due to improper inclusion of sensitive information in downloadable files. An attacker could exploit this vulnerability by authenticating to an affected device and issuing a specific set of commands. A successful exploit could allow the attacker to obtain hashed credentials of system users. To exploit this vulnerability an attacker would need to have valid user credentials with elevated privileges.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), CWE-538 (Insertion of Sensitive Information into Externally-Accessible File or Directory)

## Which versions are affected by CVE-2021-1406?

It affects 1 product.


Products: Cisco Unified Communications Manager.

## How do I fix CVE-2021-1406?

No fix has been published for CVE-2021-1406 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1406 being exploited?

There is no known exploitation of CVE-2021-1406 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Unified Communications Manager

- [CVE-2026-20230](https://insights.sbomify.com/CVE-2026-20230/): Cisco Unified Communications Manager Server-Side Request Forgery (SSRF) (high 8.6, exploited in the wild)
- [CVE-2026-20045](https://insights.sbomify.com/CVE-2026-20045/): Cisco Unified Communications Products Code Injection (high 8.2, exploited in the wild)
- [CVE-2025-20309](https://insights.sbomify.com/CVE-2025-20309/): Cisco Unified Communications Manager Static SSH Credentials Vulnerability (critical 10.0)
- [CVE-2011-1643](https://insights.sbomify.com/CVE-2011-1643/): Information disclosure in n/a (critical 10.0)
- [CVE-2024-20253](https://insights.sbomify.com/CVE-2024-20253/): Deserialization in Cisco Packaged Contact Center Enterprise (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1406 and fix it if it is affected.

What it is: CVE-2021-1406 is a medium-severity vulnerability in Cisco Unified Communications Manager, published on 8 Apr 2021. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-1406 in the wild and no public exploit code.

Affected product: Cisco Unified Communications Manager. 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-2021-1406/ (Markdown: https://insights.sbomify.com/CVE-2021-1406/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1406
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1406
- OSV: https://osv.dev/vulnerability/CVE-2021-1406

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1406/
Summaries are generated and may contain mistakes; the official description above is the record.