What’s Vulnerable › Vulnerabilities

CVE-2014-3347

• Severity: medium (CVSS 5.4 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2014-08-28 · updated 2026-06-17
• Weakness: CWE-399

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.

Affected products

• Cisco 1801 Integrated Service Router: all versions
• Cisco 1802 Integrated Service Router: all versions
• Cisco 1803 Integrated Service Router: all versions
• Cisco 1811 Integrated Service Router: all versions
• Cisco 1812 Integrated Service Router: all versions
• Cisco 1841 Integrated Service Router: all versions
• Cisco 1861 Integrated Service Router: all versions
• Cisco IOS: 15.1(4)m2

References

• http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3347
• http://tools.cisco.com/security/center/viewAlert.x?alertId=35453
• http://www.securityfocus.com/bid/69439
• http://www.securitytracker.com/id/1030772
• https://exchange.xforce.ibmcloud.com/vulnerabilities/95558
• http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3347
• http://tools.cisco.com/security/center/viewAlert.x?alertId=35453
• http://www.securityfocus.com/bid/69439
• http://www.securitytracker.com/id/1030772
• https://exchange.xforce.ibmcloud.com/vulnerabilities/95558

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