# CVE-2017-6603: Denial of service in Cisco ASR 903 and ASR 920 Series Devices

> An unauthenticated adjacent attacker can cause a denial of service on Cisco ASR 903/920 devices with RSP2 cards via incorrect IPv6 packet processing.

- **Severity:** Medium 6.5 (`CVSS:3.0/AV:A/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:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Apr 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-h4x6-qj3h-xgg8

## What is CVE-2017-6603?

CVE-2017-6603 is a medium-severity denial of service vulnerability in Cisco ASR 903 and ASR 920 Series Devices, published on 7 Apr 2017. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability in Cisco ASR 903 or ASR 920 Series Devices running with an RSP2 card could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on a targeted system because of incorrect IPv6 Packet Processing. More Information: CSCuy94366. Known Affected Releases: 15.4(3)S3.15. Known Fixed Releases: 15.6(2)SP 15.6(1.31)SP.

## Which versions are affected by CVE-2017-6603?

It affects 1 product.


Products: Cisco Asr 900 Series Firmware.

## How do I fix CVE-2017-6603?

No fix has been published for CVE-2017-6603 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-6603 being exploited?

There is no known exploitation of CVE-2017-6603 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-6603 and fix it if it is affected.

What it is: CVE-2017-6603 is a medium-severity denial of service vulnerability in Cisco ASR 903 and ASR 920 Series Devices, published on 7 Apr 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-6603 in the wild and no public exploit code.

Affected product: Cisco ASR 903 and ASR 920 Series Devices. 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-2017-6603/ (Markdown: https://insights.sbomify.com/CVE-2017-6603/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-6603
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-6603
- OSV: https://osv.dev/vulnerability/CVE-2017-6603

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-6603/
Summaries are generated and may contain mistakes; the official description above is the record.