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

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MEDIUM

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

Published Aug 28, 2014

5.4

MEDIUM

CVSS 2.0

EPSS 0.98%

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

Remediation

No remediation recorded yet.

Metrics

0.98% 0.00976

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00976

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.98% (0.00976)	60.74th	v5 (v2026.06.15)
Jun 15, 2026	0.98% (0.00976)	57.38th	v5 (v2026.06.15)
Mar 17, 2025	0.48% (0.00476)	62.86th	v4 (v2025.03.14)
Dec 12, 2024	1.35% (0.01355)	86.76th	v3 (v2023.03.01)
May 6, 2024	1.35% (0.01355)	86.09th	v3 (v2023.03.01)
Mar 7, 2023	1.35% (0.01355)	84.09th	v3 (v2023.03.01)
Mar 6, 2023	1.21% (0.01213)	66.61th	v2 (v2022.01.01)
Feb 17, 2023	1.21% (0.01213)	66.22th	v2 (v2022.01.01)
Apr 1, 2022	1.21% (0.01213)	64.21th	v2 (v2022.01.01)
Feb 4, 2022	1.21% (0.01213)	40.54th	v2 (v2022.01.01)

Weaknesses (1)

CWE-399

References (5)

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3347
vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=35453
x_refsource_CONFIRMVendor Advisory
http://www.securityfocus.com/bid/69439
vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1030772
vdb-entryx_refsource_SECTRACK
https://exchange.xforce.ibmcloud.com/vulnerabilities/95558
vdb-entryx_refsource_XF

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3347		vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=35453		x_refsource_CONFIRMVendor Advisory
http://www.securityfocus.com/bid/69439		vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1030772		vdb-entryx_refsource_SECTRACK
https://exchange.xforce.ibmcloud.com/vulnerabilities/95558		vdb-entryx_refsource_XF

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Aug 28, 2014

Updated Aug 6, 2024

Reserved May 7, 2014

Link CVE-2014-3347

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2014-3347

Red Hat

Severity n/a

Public date n/a

Links CVE-2014-3347