CVE-2012-3946 — Cisco IOS before 15.3(2)S allows remote attackers to bypass interface ACL restrictions in opportunistic circumstances by sending IPv6 packets in an unspecified scenario in which expected packet drops do not occur for "a small percentage" of the packets, aka Bug ID CSCty73682

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MEDIUM

Cisco IOS before 15.3(2)S allows remote attackers to bypass interface ACL restrictions in opportunistic circumstances by sending IPv6 packets in an unspecified scenario in which expected packet drops do not occur for "a small percentage" of the packets, aka Bug ID CSCty73682

Published Apr 24, 2014

5.0

MEDIUM

CVSS 2.0

EPSS 1.90%

Description

Cisco IOS before 15.3(2)S allows remote attackers to bypass interface ACL restrictions in opportunistic circumstances by sending IPv6 packets in an unspecified scenario in which expected packet drops do not occur for "a small percentage" of the packets, aka Bug ID CSCty73682.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.90% 0.01895

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

EPSS probability 0.01895

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 (11 key points)

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

Date	Score	Percentile	Model
Oct 1, 2026	1.90% (0.01895)	78.88th	v5 (v2026.06.15)
Jun 15, 2026	1.88% (0.01880)	76.66th	v5 (v2026.06.15)
Mar 17, 2025	0.21% (0.00213)	41.81th	v4 (v2025.03.14)
Dec 12, 2024	0.40% (0.00403)	74.50th	v3 (v2023.03.01)
Mar 6, 2024	0.45% (0.00454)	74.63th	v3 (v2023.03.01)
Feb 8, 2024	0.34% (0.00341)	70.68th	v3 (v2023.03.01)
Mar 7, 2023	0.34% (0.00341)	66.89th	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-264

References (1)

http://www.cisco.com/c/en/us/td/docs/ios/15_3s/release/notes/15_3s_rel_notes/15_3s_caveats_15_3_2s.html
x_refsource_CONFIRM

Link	Providers	Tags
http://www.cisco.com/c/en/us/td/docs/ios/15_3s/release/notes/15_3s_rel_notes/15_3s_caveats_15_3_2s.html		x_refsource_CONFIRM

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Apr 24, 2014

Updated Aug 6, 2024

Reserved Jul 10, 2012

Link CVE-2012-3946

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2012-3946

Red Hat

Severity n/a

Public date n/a

Links CVE-2012-3946