# CVE-2019-15977: Cisco Data Center Network Manager Authentication Bypass Vulnerabilities

> Unauthenticated remote attackers can bypass authentication to execute arbitrary actions with administrative privileges on Cisco Data Center Network Manager.

- **Severity:** Critical 9.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Jan 2020
- **Updated:** 15 Nov 2024
- **Also known as:** GHSA-vwxm-w88w-cmq3

## What is CVE-2019-15977?

CVE-2019-15977 is a critical authentication bypass vulnerability in Cisco Data Center Network Manager, published on 6 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Multiple vulnerabilities in the authentication mechanisms of Cisco Data Center Network Manager (DCNM) could allow an unauthenticated, remote attacker to bypass authentication and execute arbitrary actions with administrative privileges on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Weakness: CWE-798 (Use of Hard-coded Credentials)

## Which versions are affected by CVE-2019-15977?

It affects 1 product.


Products: Cisco Data Center Network Manager.

## How do I fix CVE-2019-15977?

No fix has been published for CVE-2019-15977 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-15977 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-15977 exists.

Public exploit code:

- Cisco Data Center Network Manager 11.2.1 - 'LanFabricImpl' Command Injection (exploitdb)

## Other vulnerabilities in Cisco Data Center Network Manager

- [CVE-2020-3382](https://insights.sbomify.com/CVE-2020-3382/): Cisco Data Center Network Manager Authentication Bypass Vulnerability (critical 9.8)
- [CVE-2019-15975](https://insights.sbomify.com/CVE-2019-15975/): Cisco Data Center Network Manager Authentication Bypass Vulnerabilities (critical 9.8)
- [CVE-2019-15976](https://insights.sbomify.com/CVE-2019-15976/): Cisco Data Center Network Manager Authentication Bypass Vulnerabilities (critical 9.8)
- [CVE-2019-1619](https://insights.sbomify.com/CVE-2019-1619/): Cisco Data Center Network Manager Authentication Bypass Vulnerability (critical 9.8)
- [CVE-2019-1620](https://insights.sbomify.com/CVE-2019-1620/): Cisco Data Center Network Manager Arbitrary File Upload and Remote Code Execution Vulnerability (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-15977 and fix it if it is affected.

What it is: CVE-2019-15977 is a critical authentication bypass vulnerability in Cisco Data Center Network Manager, published on 6 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-15977 exists.

Affected product: Cisco Data Center Network 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-2019-15977/ (Markdown: https://insights.sbomify.com/CVE-2019-15977/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-15977
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-15977
- OSV: https://osv.dev/vulnerability/CVE-2019-15977

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-15977/
Summaries are generated and may contain mistakes; the official description above is the record.