# CVE-2018-0209: Denial of service in Cisco 550X Series Stackable Managed Switches

> An authenticated remote attacker can cause a Cisco 550X switch to reload unexpectedly by sending heavy SNMP traffic, resulting in a denial of service.

- **Severity:** High 7.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Mar 2018
- **Updated:** 2 Dec 2024
- **Also known as:** GHSA-xxm7-jh4x-3p4j

## What is CVE-2018-0209?

CVE-2018-0209 is a high-severity denial of service vulnerability in Cisco 550X Series Stackable Managed Switches, published on 8 Mar 2018. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem communication channel through the Cisco 550X Series Stackable Managed Switches could allow an authenticated, remote attacker to cause the device to reload unexpectedly, causing a denial of service (DoS) condition. The device nay need to be manually reloaded to recover. The vulnerability is due to lack of proper input throttling of ingress SNMP traffic over an internal interface. An attacker could exploit this vulnerability by sending a crafted, heavy stream of SNMP traffic to the targeted device. An exploit could allow the attacker to cause the device to reload unexpectedly, causing a DoS condition. Cisco Bug IDs: CSCvg22135.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-0209?

It affects 1 product.


Products: Cisco Small Business 500 Series Stackable Managed Switches Firmware.

## How do I fix CVE-2018-0209?

No fix has been published for CVE-2018-0209 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-0209 being exploited?

There is no known exploitation of CVE-2018-0209 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-0209 and fix it if it is affected.

What it is: CVE-2018-0209 is a high-severity denial of service vulnerability in Cisco 550X Series Stackable Managed Switches, published on 8 Mar 2018. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-0209 in the wild and no public exploit code.

Affected product: Cisco 550X Series Stackable Managed Switches. 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-2018-0209/ (Markdown: https://insights.sbomify.com/CVE-2018-0209/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-0209
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-0209
- OSV: https://osv.dev/vulnerability/CVE-2018-0209

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-0209/
Summaries are generated and may contain mistakes; the official description above is the record.