CVE-2011-3281 — Unspecified vulnerability in Cisco IOS 15.0 through 15.1, in certain HTTP Layer 7 Application Control and Inspection configurations, allows remote attackers to cause a denial of service (device reload or hang) via a crafted HTTP packet, aka Bug ID CSCto68554

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HIGH

Unspecified vulnerability in Cisco IOS 15.0 through 15.1, in certain HTTP Layer 7 Application Control and Inspection configurations, allows remote attackers to cause a denial of service (device reload or hang) via a crafted HTTP packet, aka Bug ID CSCto68554

Published Oct 3, 2011

7.8

HIGH

CVSS 2.0

EPSS 1.80%

Description

Unspecified vulnerability in Cisco IOS 15.0 through 15.1, in certain HTTP Layer 7 Application Control and Inspection configurations, allows remote attackers to cause a denial of service (device reload or hang) via a crafted HTTP packet, aka Bug ID CSCto68554.

Remediation

No remediation recorded yet.

Metrics

1.80% 0.01798

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

EPSS probability 0.01798

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	1.80% (0.01798)	77.67th	v5 (v2026.06.15)
Jun 15, 2026	1.80% (0.01798)	75.54th	v5 (v2026.06.15)
Mar 17, 2025	0.15% (0.00153)	33.51th	v4 (v2025.03.14)
Dec 12, 2024	0.11% (0.00106)	44.92th	v3 (v2023.03.01)
Apr 25, 2024	0.10% (0.00105)	42.10th	v3 (v2023.03.01)
Feb 8, 2024	0.10% (0.00097)	39.04th	v3 (v2023.03.01)
Mar 7, 2023	0.11% (0.00106)	41.58th	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 (0)

No CWE recorded.

References (2)

http://tools.cisco.com/security/center/viewAlert.x?alertId=24124
x_refsource_CONFIRM
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b95d57.shtml
vendor-advisoryx_refsource_CISCOVendor Advisory

Link	Providers	Tags
http://tools.cisco.com/security/center/viewAlert.x?alertId=24124		x_refsource_CONFIRM
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b95d57.shtml		vendor-advisoryx_refsource_CISCOVendor Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Oct 3, 2011

Updated Sep 17, 2024

Reserved Aug 29, 2011

Link CVE-2011-3281

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 16, 2026

Link CVE-2011-3281

Red Hat

Severity n/a

Public date n/a

Links CVE-2011-3281