How severe is CVE-2014-3347?

CVE-2014-3347 has a CVSS 2.0 base score of 5.4, rated medium severity.

Is CVE-2014-3347 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2014-3347?

CVE-2014-3347 primarily affects Cisco Ios. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2014-3347?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2014-3347 published?

CVE-2014-3347 was published on 2014-08-28 and last updated on 2026-06-17.

CVE-2014-3347

CVE-2014-3347 is a medium-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-399.

Key facts

Severity: Medium (CVSS 2.0 base score 5.4)
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Ios
Published: 2014-08-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2014-3347?: 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.
How severe is CVE-2014-3347?: CVE-2014-3347 has a CVSS 2.0 base score of 5.4, rated medium severity.
Is CVE-2014-3347 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2014-3347?: CVE-2014-3347 primarily affects Cisco Ios. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2014-3347?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2014-3347 published?: CVE-2014-3347 was published on 2014-08-28 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:o:cisco:ios:15.1\(4\)m2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:1801_integrated_service_router:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:1802_integrated_service_router:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:1803_integrated_service_router:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:1811_integrated_service_router:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:1812_integrated_service_router:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:1841_integrated_service_router:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:1861_integrated_service_router:-:*:*:*:*:*:*:*

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