# CVE-2017-6663: Cisco IOS Software and Cisco IOS XE Software Denial-of-Service

> An unauthenticated adjacent attacker can cause autonomic nodes to reload, resulting in a denial of service condition.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Yes, since 3 Mar 2022 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Aug 2017
- **Updated:** 21 Oct 2025
- **Also known as:** GHSA-3h3r-w377-6ffg

## What is CVE-2017-6663?

CVE-2017-6663 is a medium-severity denial of service vulnerability in Cisco Ios, published on 7 Aug 2017. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in a denial of service (DoS) condition. More Information: CSCvd88936. Known Affected Releases: Denali-16.2.1 Denali-16.3.1.

## Which versions are affected by CVE-2017-6663?

It affects 2 products.


Products: Cisco Ios, Cisco Ios Xe.

## How do I fix CVE-2017-6663?

No fix has been published for CVE-2017-6663 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 24 Mar 2022.

## Is CVE-2017-6663 being exploited?

Yes. Attackers have exploited CVE-2017-6663 in the wild since at least 3 Mar 2022.

## Other vulnerabilities in Cisco Ios

- [CVE-2017-12240](https://insights.sbomify.com/CVE-2017-12240/): Cisco IOS and IOS XE Software DHCP Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-3881](https://insights.sbomify.com/CVE-2017-3881/): Cisco IOS and IOS XE Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2018-0167](https://insights.sbomify.com/CVE-2018-0167/): Cisco IOS, XR, and XE Software Buffer Overflow (high 8.8, exploited in the wild)
- [CVE-2017-6736](https://insights.sbomify.com/CVE-2017-6736/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)
- [CVE-2017-6737](https://insights.sbomify.com/CVE-2017-6737/): Cisco IOS and IOS XE Software SNMP Remote Code Execution (high 8.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-6663 and fix it if it is affected.

What it is: CVE-2017-6663 is a medium-severity denial of service vulnerability in Cisco Ios, published on 7 Aug 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2017-6663 in the wild since at least 3 Mar 2022.

Affected product: Cisco Ios. 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-2017-6663/ (Markdown: https://insights.sbomify.com/CVE-2017-6663/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-6663
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-6663
- OSV: https://osv.dev/vulnerability/CVE-2017-6663

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-6663/
Summaries are generated and may contain mistakes; the official description above is the record.