# CVE-2014-3347: Denial of service in n/a

> Remote attackers can cause a denial of service on Cisco routers with ISDN enabled by triggering a hardware encryption module failure.

- **Severity:** Medium 5.4 (`AV:N/AC:H/Au:N/C:N/I:N/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Aug 2014
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-w2gc-qf48-fjxq

## What is CVE-2014-3347?

CVE-2014-3347 is a medium-severity denial of service vulnerability in Cisco Ios, published on 28 Aug 2014. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Cisco IOS 15.1(4)M2 on Cisco 1800 ISR devices, when the ISDN Basic Rate Interface is enabled, allows remote attackers to cause a denial of service (device hang) by leveraging knowledge of the ISDN phone number to trigger an interrupt timer collision during entropy collection, leading to an invalid state of the hardware encryption module, aka Bug ID CSCul77897.

Weakness: CWE-399

## Which versions are affected by CVE-2014-3347?

It affects 8 products.


Products: Cisco 1801 Integrated Service Router, Cisco 1802 Integrated Service Router, Cisco 1803 Integrated Service Router, Cisco 1811 Integrated Service Router, Cisco 1812 Integrated Service Router, Cisco 1841 Integrated Service Router, Cisco 1861 Integrated Service Router, Cisco Ios.

## How do I fix CVE-2014-3347?

No fix has been published for CVE-2014-3347 yet. Limit exposure of the affected software until one is available.

## Is CVE-2014-3347 being exploited?

There is no known exploitation of CVE-2014-3347 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2014-3347 and fix it if it is affected.

What it is: CVE-2014-3347 is a medium-severity denial of service vulnerability in Cisco Ios, published on 28 Aug 2014. 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-2014-3347 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-2014-3347/ (Markdown: https://insights.sbomify.com/CVE-2014-3347/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2014-3347
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2014-3347
- OSV: https://osv.dev/vulnerability/CVE-2014-3347

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From sbomify Insights: https://insights.sbomify.com/CVE-2014-3347/
Summaries are generated and may contain mistakes; the official description above is the record.