# CVE-2018-0455: Cisco Firepower System Software Detection Engine Denial of Service Vulnerability

> Remote attackers can cause memory exhaustion and traffic forwarding failure in Cisco Firepower devices by sending malicious SMBv2 or SMBv3 traffic.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 5 Oct 2018
- **Updated:** 26 Nov 2024
- **Also known as:** GHSA-8cr6-pqj8-xf85

## What is CVE-2018-0455?

CVE-2018-0455 is a high-severity denial of service vulnerability in Cisco FireSIGHT System Software, published on 5 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the Server Message Block Version 2 (SMBv2) and Version 3 (SMBv3) protocol implementation for the Cisco Firepower System Software could allow an unauthenticated, remote attacker to cause the device to run low on system memory, possibly preventing the device from forwarding traffic. It is also possible that a manual reload of the device may be required to clear the condition. The vulnerability is due to incorrect SMB header validation. An attacker could exploit this vulnerability by sending a custom SMB file transfer through the targeted device. A successful exploit could cause the device to consume an excessive amount of system memory and prevent the SNORT process from forwarding network traffic. This vulnerability can be exploited using either IPv4 or IPv6 in combination with SMBv2 or SMBv3 network traffic.

Weakness: CWE-19

## Which versions are affected by CVE-2018-0455?

It affects 1 product.


Products: Cisco Firepower System Software.

## How do I fix CVE-2018-0455?

No fix has been published for CVE-2018-0455 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0455 being exploited?

There is no known exploitation of CVE-2018-0455 in the wild and no public exploit code.

## Other vulnerabilities in Cisco FireSIGHT System Software

- [CVE-2018-15443](https://insights.sbomify.com/CVE-2018-15443/): Cisco Firepower Detection Engine TCP Intrusion Prevention System Rule Bypass Vulnerability (medium 5.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0455 and fix it if it is affected.

What it is: CVE-2018-0455 is a high-severity denial of service vulnerability in Cisco FireSIGHT System Software, published on 5 Oct 2018. 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-2018-0455 in the wild and no public exploit code.

Affected product: Cisco FireSIGHT System Software. 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-2018-0455/ (Markdown: https://insights.sbomify.com/CVE-2018-0455/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0455
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0455
- OSV: https://osv.dev/vulnerability/CVE-2018-0455

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0455/
Summaries are generated and may contain mistakes; the official description above is the record.