# CVE-2017-12300: Security feature bypass in Cisco Firepower System Software

> An unauthenticated remote attacker can bypass SMB2 blocking policies in Cisco Firepower by sending crafted requests, requiring specific file policy configurations.

- **Severity:** Medium 5.8 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Nov 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-v68r-xxfh-w776

## What is CVE-2017-12300?

CVE-2017-12300 is a medium-severity vulnerability in Cisco Secure Firewall Management Center, published on 16 Nov 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the SNORT detection engine of Cisco Firepower System Software could allow an unauthenticated, remote attacker to bypass a file policy that is configured to block the Server Message Block Version 2 (SMB2) protocol. The vulnerability is due to the incorrect detection of an SMB2 file when the detection is based on the length of the file. An attacker could exploit this vulnerability by sending a crafted SMB2 transfer request through the targeted device. A successful exploit could allow the attacker to bypass filters that are configured to block SMB2 traffic. Cisco Bug IDs: CSCve58398.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2017-12300?

It affects 1 product.


Products: Cisco Secure Firewall Management Center.

## How do I fix CVE-2017-12300?

No fix has been published for CVE-2017-12300 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-12300 being exploited?

There is no known exploitation of CVE-2017-12300 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Secure Firewall Management Center

- [CVE-2026-20079](https://insights.sbomify.com/CVE-2026-20079/): Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel (critical 10.0, exploited in the wild)
- [CVE-2026-20131](https://insights.sbomify.com/CVE-2026-20131/): Cisco Secure Firewall Management Center (FMC) Software and Cisco Security Cloud Control (SCC) Firewall Management Deserialization of Untrusted Data (critical 10.0, exploited in the wild)
- [CVE-2026-20316](https://insights.sbomify.com/CVE-2026-20316/): Cisco Secure Firewall Management Center Use of Hard-coded Password (medium 5.3, exploited in the wild)
- [CVE-2025-20265](https://insights.sbomify.com/CVE-2025-20265/): Cisco Secure Firewall Management Center Software Radius Remote Code Execution Vulnerability (critical 10.0)
- [CVE-2024-20424](https://insights.sbomify.com/CVE-2024-20424/): Command injection in Cisco Firepower Management Center (critical 9.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-12300 and fix it if it is affected.

What it is: CVE-2017-12300 is a medium-severity vulnerability in Cisco Secure Firewall Management Center, published on 16 Nov 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-12300 in the wild and no public exploit code.

Affected product: Cisco Secure Firewall Management Center. 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-2017-12300/ (Markdown: https://insights.sbomify.com/CVE-2017-12300/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-12300
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-12300
- OSV: https://osv.dev/vulnerability/CVE-2017-12300

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-12300/
Summaries are generated and may contain mistakes; the official description above is the record.