# CVE-2017-12211: Denial of service in Cisco IOS and Cisco IOS XE

> An authenticated remote attacker can cause high CPU usage or device reload by exploiting IPv6 SNMP code corruption in Cisco IOS.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/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:** 7 Sep 2017
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-7664-hhqm-4p3m

## What is CVE-2017-12211?

CVE-2017-12211 is a medium-severity denial of service vulnerability in Cisco Ios, published on 7 Sep 2017. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in the IPv6 Simple Network Management Protocol (SNMP) code of Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote attacker to cause high CPU usage or a reload of the device. The vulnerability is due to IPv6 sub block corruption. An attacker could exploit this vulnerability by polling the affected device IPv6 information. An exploit could allow the attacker to trigger high CPU usage or a reload of the device. Known Affected Releases: Denali-16.3.1. Cisco Bug IDs: CSCvb14640.

Weakness: CWE-399

## Which versions are affected by CVE-2017-12211?

It affects 2 products.


Products: Cisco Ios, Cisco Ios Xe.

## How do I fix CVE-2017-12211?

No fix has been published for CVE-2017-12211 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-12211 being exploited?

There is no known exploitation of CVE-2017-12211 in the wild and no public exploit code.

## 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-2017-12211 and fix it if it is affected.

What it is: CVE-2017-12211 is a medium-severity denial of service vulnerability in Cisco Ios, published on 7 Sep 2017. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-12211 in the wild and no public exploit code.

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-2017-12211/ (Markdown: https://insights.sbomify.com/CVE-2017-12211/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-12211
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-12211
- OSV: https://osv.dev/vulnerability/CVE-2017-12211

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-12211/
Summaries are generated and may contain mistakes; the official description above is the record.