CVE-2014-2109 — The TCP Input module in Cisco IOS 12.2 through 12.4 and 15.0 through 15.4, when NAT is used, allows remote attackers to cause a denial of service (memory consumption or device reload) via crafted TCP packets, aka Bug IDs CSCuh33843 and CSCuj41494

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HIGH

The TCP Input module in Cisco IOS 12.2 through 12.4 and 15.0 through 15.4, when NAT is used, allows remote attackers to cause a denial of service (memory consumption or device reload) via crafted TCP packets, aka Bug IDs CSCuh33843 and CSCuj41494

Published Mar 27, 2014

7.8

HIGH

CVSS 2.0

EPSS 2.24%

Description

The TCP Input module in Cisco IOS 12.2 through 12.4 and 15.0 through 15.4, when NAT is used, allows remote attackers to cause a denial of service (memory consumption or device reload) via crafted TCP packets, aka Bug IDs CSCuh33843 and CSCuj41494.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.24% 0.02237

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

EPSS probability 0.02237

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	2.24% (0.02237)	82.19th	v5 (v2026.06.15)
Jun 15, 2026	2.22% (0.02218)	80.29th	v5 (v2026.06.15)
Mar 17, 2025	1.49% (0.01487)	79.75th	v4 (v2025.03.14)
Dec 12, 2024	0.19% (0.00186)	57.24th	v3 (v2023.03.01)
Jul 10, 2024	0.19% (0.00186)	56.24th	v3 (v2023.03.01)
Mar 7, 2023	0.19% (0.00186)	54.19th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)

Weaknesses (1)

CWE-20

Improper Input Validation

References (2)

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140326-nat
vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/66470
vdb-entryx_refsource_BID

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140326-nat		vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/66470		vdb-entryx_refsource_BID

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Mar 27, 2014

Updated Aug 6, 2024

Reserved Feb 25, 2014

Link CVE-2014-2109

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2014-2109

Red Hat

Severity n/a

Public date n/a

Links CVE-2014-2109