# CVE-2016-9203: Denial of service in Cisco ASR 5000

> An unauthenticated remote attacker can cause a reload of the ipsecmgr process in Cisco ASR 5000 Series Software, leading to a denial of service.

- **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:** 14 Dec 2016
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-53x7-9h7x-57wx

## What is CVE-2016-9203?

CVE-2016-9203 is a high-severity denial of service vulnerability in Cisco ASR 5000, published on 14 Dec 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) feature of Cisco ASR 5000 Series Software could allow an unauthenticated, remote attacker to cause a reload of the ipsecmgr process. More Information: CSCvb38398. Known Affected Releases: 20.2.3 20.2.3.65026. Known Fixed Releases: 21.1.M0.65431 21.1.PP0.65733 21.1.R0.65467 21.1.R0.65496 21.1.VC0.65434 21.1.VC0.65489 21.2.A0.65437.

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

## Which versions are affected by CVE-2016-9203?

It affects 1 product.


Products: Cisco Asr 5000 Series Software.

## How do I fix CVE-2016-9203?

No fix has been published for CVE-2016-9203 yet. Limit exposure of the affected software until one is available.

## Is CVE-2016-9203 being exploited?

There is no known exploitation of CVE-2016-9203 in the wild and no public exploit code.

## Other vulnerabilities in Cisco ASR 5000

- [CVE-2017-3819](https://insights.sbomify.com/CVE-2017-3819/): Privilege escalation in Cisco StarOS (high 8.8)
- [CVE-2017-6612](https://insights.sbomify.com/CVE-2017-6612/): Open redirect in Cisco ASR 5000 Series Aggregation Services Routers (high 8.6)
- [CVE-2017-6672](https://insights.sbomify.com/CVE-2017-6672/): Security feature bypass in Cisco ASR 5000 Series Aggregation Services Routers (high 7.5)
- [CVE-2016-6467](https://insights.sbomify.com/CVE-2016-6467/): Denial of service in Cisco Aggregation Services Router (ASR) 5000 Series Switch (high 7.5)
- [CVE-2016-6466](https://insights.sbomify.com/CVE-2016-6466/): Denial of service in Cisco StarOS 20.0.0 through 21.0.M0.64246 (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2016-9203 and fix it if it is affected.

What it is: CVE-2016-9203 is a high-severity denial of service vulnerability in Cisco ASR 5000, published on 14 Dec 2016. 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-2016-9203 in the wild and no public exploit code.

Affected product: Cisco ASR 5000. 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-2016-9203/ (Markdown: https://insights.sbomify.com/CVE-2016-9203/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2016-9203
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2016-9203
- OSV: https://osv.dev/vulnerability/CVE-2016-9203

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From sbomify Insights: https://insights.sbomify.com/CVE-2016-9203/
Summaries are generated and may contain mistakes; the official description above is the record.