CVE-2014-3347

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.0% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2014-08-28 23:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:08 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.0% in the next 30 days (EPSS).
• Severity: 5.4 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2014-08-28 23:55 UTC

Last modified

2026-06-17 00:08 UTC

Exploit probability

1.0% · EPSS, next 30 days

Weakness

CWE-399

Record status

Modified

Affected

• Cisco iOS 15.1\(4\)m2
• 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

Attack profile CVSS 2.0 · 5.4

Attack vector

Network

Complexity

High

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

Is it in your code?

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